Nova (1974–…): Season 41, Episode 8 - Inside Animal Minds: Bird Genius - full transcript
From PBS - Today, researchers are discovering that some creatures have mastered skills purportedly restricted to humans. Many are bird brains. Meet a cockatoo with a talent for picking locks; a wild crow on a mission to solve an eight-step puzzle; and a tame raven who can solve a puzzle box so quickly that his performance has to be captured with high-speed photography. Are these skills really evidence of high intelligence or just parlor tricks, the result of training and instinct? To find out, NOVA tests the limits of some of the planet's brainiest animals, searching for the secrets of a problem-solving mind.
What are they thinking?
What really makes them tick?
Oh, look at that face!
Is there any way to get inside
the animal mind?
What I really want to know
is what is it like
to be an animal,
what's it like to be
inside their head
and what are the problems
they have to solve,
and how do they think,
and are they like us
or are they like something
totally different?
They have some amazing abilities
Is it instinct
training
or something else?
Cutting-edge animal science
reveals new answers,
getting inside their heads
in ways never before possible
Without proper training,
the dogs would just run scared
from the MRI
We put different species
to the test
in search of the roots
of animal intelligence
Who are the best
problem solvers?
Who wins the battle
of the super senses?
Dive deep into
the animal experience
to explore their language
relationships
even emotions
If you start giving
one of them grapes,
which are far better
than cucumber,
then the one who gets cucumber
becomes very upset
Are they more like us
than we ever thought possible?
Having a sense of self
might go with complex
understanding of others
On this episode
How smart is this bird brain?
Imagine that you're a crow
Here's your food in a deep hole
How would you go about
solving this problem?
They use tools
and pick locks
But what happens
in a brainy smackdown
between this bird
and man's best friend?
How did a creature
with such a tiny brain
get so smart?
A crow's brain in relative terms
is as big as that
of a chimpanzee
Why is it that that animal
can solve those problems?
Why would we observe that level
of flexibility
in that species of bird
that we don't observe
in another species?
"Inside Animal Minds:
Bird Genius,"
right now on NOVA.
We've always admired birds
for their grace and beauty
But we don't usually think
of them as incredibly bright
After all, isn't "bird-brained"
the very essence of stupidity?
But now, scientists
are discovering bird brains
that put most other animals
to shame
That's no surprise to Lloyd Buck
There it is
Lloyd handles birds
for TV and film,
and one of his stars
is a raven named Bran
There's a good boy
Well this is Bran,
and he's a three-year-old raven
We've had him since he was
about ten days old,
so he's what you call
complete social imprint
on humans, but he's
particularly bonded with me
We share a very, very close bond
Captive ravens can live
60 years or more,
so Lloyd and Bran are in
for a long-term relationship
Are you going to do it again?
But right now,
Bran wants to explore
his relationship with the camera
Going to hold finger?
No
Sorry, he likes your camera
It's the highest point
That's a good boy
To keep his demanding bird
occupied,
Lloyd gives Bran puzzles
to solve on his own
Here's a problem
Lloyd first presented to Bran
a few months ago in his aviary,
where he has a bird bath
Lloyd places a piece of food
inside a plastic bottle
and crushes it
so the food is trapped
But this doesn't stop Bran
First, he adds water
Next, he swishes it around
And the liquid carries the food
past the restriction and out
That is a clever
piece of problem solving
Good boy
You're clever
Bran wasn't taught
to solve this problem
Lloyd just gave him
the challenge one afternoon
and left Bran alone to try
to find a solution himself
So we've presented him
with that problem,
and through his own intelligence
and problem solving abilities
he worked out
to use his own water,
what he had around him
to his advantage,
which I think shows
a lot of intelligence
People who've observed crows
and ravens closely have said
that they are pretty clever
creatures
But in recent years,
new experiments
are probing deeper,
trying to solve the secrets
of their problem-solving brains
And beyond birds,
researchers are discovering
more and more animals
doing things
we once thought
were strictly human
So how smart
are these creatures?
Inside their minds,
are they analyzing
and solving problems
the way we do?
Or are these animals' skills
more like parlor tricks,
the result of training
and fueled by instinct?
What I really want to know
is what is it like
to be an animal,
what's it like to be
inside their head
and what are the problems
they have to solve,
and how do they think,
and are they like us
or are they like
something totally different?
From the beginning,
one way that humans
have solved problems has been
by using tools
It was once considered proof
of our superior intellect
But it turns out,
all kinds of animals use tools
Even an octopus...
A close relative to clams
and oysters... can do it
Off the coast of Indonesia,
this veined octopus
finds a discarded coconut shell
on the sea floor
and uses it to protect itself
from predators
First it crawls
inside the hard shell
Then it uses its eight arms
to carry it off
People used to think that
tool use was unique to humans,
but of course
that has never been the case
Ever since Darwin,
we've known that animals
have been using tools
But what's really unique
is tool manufacturing
Humans, of course, manufacture
a huge array of tools
for different purposes
And for centuries,
we thought that only humans
were smart enough to make a tool
All that changed in the 1960s,
when Jane Goodall
discovered chimpanzees
breaking all the rules
I saw this dark shape
hunched over a termite mound
He's making arm movements
as though he's sliding it
across the ground
And obviously eating
Not only did Goodall see chimps
using blades of grass as tools
to fish for termites,
but she also witnessed them
making tools by stripping leaves
off twigs
Her research supervisor
was amazed
He sent his famous reply,
"Now we have to redefine man,
redefine tool
or accept chimpanzees as humans"
Goodall's discovery
shattered our ideas
about what sets us apart from
the rest of the animal kingdom
We had to accept that animals
were smarter than we'd
given them credit for
She created basically
an environment
that we have to think
about their minds,
and we have to recognize
the fact that in many cases,
animals may have abilities
that we thought
were the province of humans
Today, animals with impressive
skills and brainpower
can be found on land
and sea
and air
And some of the most surprising
can be found here:
New Caledonia
Lying nearly 1,000 miles
east of Australia,
this remote Pacific island
is home to an animal
hailed by some as one
of the smartest on Earth,
in part because along
with humans and chimps,
it is an expert tool maker
Meet the New Caledonian Crow
In the wild,
the crows shape hooked sticks
and use them to spear grubs
But today, biologist Alex Taylor
is designing an experiment
to see if crows can use tools
in new ways to solve problems
Alex works with wild birds,
which he releases
after a three month period
This one is nicknamed 007
007's mission is to get
a tasty piece of meat
out of this narrow plastic box
What we have here
is our deep hole
This has got some meat in
The meat is positioned
so deep in the narrow box,
it's out of reach of 007's beak
But Alex has placed a number
of other objects nearby
The question is, can 007 use
them to get the piece of meat?
Imagine that you're a crow
Here's your food in a deep hole
How would you go about,
with the tools available to you
on this table,
solving this problem?
007's toolkit includes
a short stick
hanging on a piece of string,
three stones inside wooden cages
and a longer stick
trapped in a plastic box
First, the crow must use the
short stick to get the stones
And then use all three stones
to get the long stick
And now the crows can take this
and probe it into the hole
and roll...
Much better than I can...
The food out of the hole
and get themselves
a nice tasty reward
It's a complicated task
007 is familiar with the
individual pieces of the puzzle
He's done each of them
separately for a treat
For example, he's used stones
to get a piece of meat
out of the trap door box
But this is the first time
he's seen the tools
arranged like this:
eight separate stages
that must be completed
in a particular order
if the puzzle is to be solved
At first, he takes time
to check things out
Then goes for the little stick
He tries to use it
to reach the meat,
but it's too short
So he sets off
to get the first stone
Got it!
But he doesn't seem to know
what to do with it
He gets another stone
But he appears to be stuck
Now, something seems to click
He puts the first stone
into the box
where the long stick is trapped
Then the second stone
And returns to collect
the last one
He's got the long stick
and goes right for the meat
The final stage
Success
007 successfully executed
all eight tasks
to collect the out of reach
treat
How did he do it?
One of the striking things
is how skillfully 007 employs
a number of different tools
to get what he wants
That's because New Caledonian
crows are born tool-users
Auguste von Bayern
is an expert in corvids,
the family of birds
that includes crows, ravens,
jays and rooks like this one
New Caledonian crows
have evolved
with several physical features
that allow them
to more easily manipulate
objects...
Particularly sticks
New Caledonian crows are famous
for their very straight beak,
and it turns out this is
an adaptation to their tool use
This is really striking
because other corvids
have curvy beaks
You can see that very well
in the rook
The straight beak
allows the New Caledonian crow
to hold tools in front of it,
in its line of vision
But that's not all
New Caledonian crows have eyes
set closer together
than other birds,
which means there is
a significant overlap
of what their two eyes can see
This helps the crow to focus
on the end of a tool
They can see the working end
of the tool extremely well
and look into the narrow holes
and see what they're doing
Tools aren't a recent discovery
for the New Caledonian crow
They've been using them
for so long,
they have physically adapted
to tool use
No other adaptation like this
has been described
in any other tool-using animal,
so this is fairly special
So the eight stage puzzle
didn't pose
too much of a physical challenge
for the crow
But how did it figure out
which order to perform
the tasks?
What was going on in its mind?
Did it imagine the entire
solution to the puzzle?
Was it just using trial
and error step-by-step?
Was it conditioned
by its training
on the individual parts?
Or is the answer
somewhere in between?
Can animals essentially imagine
or infer or reason
about how to solve a problem
they've never seen before
and come up with a solution
that then they can act on?
On the face of it,
the crow's abilities
seem impressive
But look closely enough,
and the natural world
is filled with examples
of animals behaving
in what look like clever ways
The spider spins a web
that is precision-engineered
to catch flies
Turtles navigate
through thousands of miles
of featureless ocean,
returning to the same beaches
every year to lay eggs
It's as if they hold
a nautical map in their heads
So are the crows
really so unusual?
To begin to find out,
we need to delve
into the animal mind
and see how other animals
solve problems
Like the honeybee:
a small animal that is able
to do something
that seems incredibly smart
Insect expert Adam Hart
is interested in how bees
solve a very difficult problem
Inside a typical hive, there are
about 40,000 honeybees
Every day,
they face the challenge
of having to feed themselves
The pollen and nectar
that bees eat
is only available
when flowers are in bloom
So in spring and summer,
the bees have to collect
enough of it to eat
and enough to turn into honey
to keep the hive going
through the winter
Sometimes they can fly
more than six kilometers
to get enough
nectar and pollen back,
because they need a plentiful
and vast supply
Finding enough food is a huge
logistical challenge,
but the bees have an almost
incredible solution
Adam has set up
an observation hive
It's completely dark inside,
so infrared cameras
reveal what's going on
Initially, it looks very chaotic
It looks like bees
are everywhere
But you can see some vibrations
going on and some movements
that are actually part
of a very sophisticated
communication system
The bees perform
a striking behavior
that's key
to solving the problem
of gathering enough food
It's called the waggle dance
The waggle dance
is a very sophisticated way
of directing foragers towards
nectar in the environment
So it's telling them where to go
This bee has found
a good source of food
and she's performing a set
of very precise movements
to tell the others
exactly where to find it
It tells them the direction
and the distance of the nectar
The best way to understand how
the waggle dance actually works
is to get up high,
because then you can get
a view of the landscape
in which the bees are operating
The meaning of the waggle dance
was first proposed in the 1940s
But it wasn't proven until 2005,
when scientists were able
to track bees
using radar technology
This church tower gives Adam
a bee's eye view
of the countryside
From up here, it's easy to see
where the sun lies
over the landscape,
and where it would be
if it were on the horizon
One of the dancing bees
in the hive was waggling
at an angle of five degrees
from the vertical line
So if this tower
were a massive bee hive,
the waggle dance would be
telling us that the nectar
is five degrees
from the relative position
of the sun
But they can also
advertise distance
because the duration
of that waggle run,
that central component,
tells the bees
how far away the resource is
The closer it is,
the shorter the waggle run
So honeybees survive the winter
by using what we call geometry
They compute angles
and distances
and then transmit that
information to their hive-mates
How can a small insect
with such a tiny brain
do something
so incredibly sophisticated?
It's instinct
It's hardwired
into the bee's brain
And we know that
because if you take
older bees out of the hive,
the younger bees who have never
been exposed to a waggle dance
will spontaneously
begin waggle-dancing
and doing this behavior
It's absolutely built-in,
it's instinctive
This is an evolved behavior,
an evolved instinct,
that leads to high survival
of honeybees
Instinctive behavior
is often crucial
to the survival of a species
But the animals don't need
to have any real understanding
of what they're doing
Animal behavior often appears
very complex,
but there might be
very simple rules
underlying the pattern
that we see
So what about
the New Caledonian crow?
Researchers have found that
like bees
and their waggle-dance,
young crows will instinctively
pick up sticks with their beaks
even if they've never seen
another crow do it
But was 007 acting
just on instinct
when he solved
the eight-stage problem?
Nicky Clayton,
one of the world's
leading experts on corvids,
is convinced that
it's something more
The behavior of the
New Caledonian crow
when it's solving
one of these problems
is far more complex
than anything
that would be solved
by an instinctive mechanism
So if it isn't pure instinct,
what is it?
Scientists disagree
about what exactly is going on
in the mind of a crow like 007
or a raven like Bran
when they're solving problems
Some researchers think
the animals
are instinctive tool-users
and can be conditioned
by training
to use them in ways
that just appear clever
But others believe that animals
show real smarts
when they tackle novel problems
that they've never seen before
To demonstrate this,
we set up a little competition
to solve another puzzle
between Lloyd Buck's raven Bran
and an animal a lot of people
think of as pretty smart:
a dog
Actually, two dogs:
French poodles named
Itchy and Scratchy
It's a specially designed
puzzle box
Inside the blue ball,
there's a tasty snack
that each contestant
likes to eat:
rat meat for Bran,
a doggy treat
for Itchy and Scratchy
The challenge is to remove
the blue ball
from the two plastic boxes
First, the contenders
have the chance
to familiarize themselves
with parts of the puzzle box
As usual, Lloyd leaves Bran
to investigate on his own
Good boy
The dogs are introduced
to the components
by their owner
Itchy, concentrate, look
The outer box has a hinged door
that can be opened
by pulling on a pink ball
tied to the door with a string
Another ball and string
can then be used
to pull out the inner box
Then a third ball and string
must be pulled
to remove the lid,
freeing the blue ball
which holds the treat
And now, the moment has come
The animals are about to face
the test for the first time
This is dog versus raven
Itchy, solve this
Solve that, I'll be back
Solve it
Bran gets the tasty treat
The dogs didn't seem
to even realize
there was problem there
to solve,
despite some guidance
But Bran was so quick,
we have to use
a high-speed camera
just to see how he did it
An emphatic win for Bran
and his corvid kind
It's clear that corvids
like these have a knack
for solving problems
that involve getting food
out of hard-to-get places,
even in situations
they've never seen before
While dogs are very good
at paying attention to humans
and can be trained
to carry out complicated tasks,
they're not so good
at tackling novel problems
like this one,
despite the fact
that there's food involved
Why is it that that animal
can solve those problems?
Why would we observe
that level of flexibility
in that species of bird
that we don't observe
in another species?
Here at Cambridge University
in England,
Nicky Clayton is trying
to find out
how the corvid mind works
She sets up experiments
to break down
the different abilities
these birds use
to solve problems
And she gives one of them...
A Eurasian jay named Hoy...
A particular challenge
First, he's presented
with a plastic tube
When he puts a rock
in at the top,
a tasty food reward... a worm...
Comes out at the bottom
When he's got the hang of that,
Nicky gives him a new test
She drops some worms...
His favorite food...
Into a tube of water
out of reach,
and leaves a pile of stones
next to it
There's a delicious, tasty worm
floating on the top
At the moment, it's out of reach
Then, Hoy picks up a stone
and drops it in the tube
Does Hoy actually understand
that a sinking stone
will cause the water level
to rise,
and this in turn will allow him
to reach the worm?
When Nicky gives him
the same tube,
but this time with the worm
sitting on sand instead of water
Hoy does not use the stones
Nicky believes he understands
the difference
He seems to understand
that it's only any good
if there's a liquid in the tube
It's a very useful skill
when it comes
to solving problems:
the ability to make a connection
between cause... the stone...
And effect...
The rising water level
Cause and effect is the ability
to understand what causes what,
why did a particular
event occur,
if you can identify that
so you know what causes it
And that means as humans,
we're able to recreate
that same cause
to get that same effect,
and that's a really
powerful skill
To figure out step one,
putting stones in the tube,
Hoy took the knowledge
from the training task
and transferred it
to the new one
This is another skill
many corvids display
when tackling problems:
the ability to think flexibly,
to use information learned
in one situation
and apply it to another
Flexible thinking is the ability
to transfer information,
knowledge, from one problem
to a brand new problem
So it's applying knowledge
to new contexts
And this is how
the New Caledonian crow
solved the multistage problem
New Caledonian crows
need flexibility
in their environment they
evolved in to process food,
and to be able to get access
to food in new ways using tools
in settings they may not
have encountered before
This also explains how Bran
quickly solved the puzzle box
The birds were thinking
flexibly, an ability
that seems to be missing in dogs
So why are some animals better
at solving problems than others?
It's something we don't
yet fully understand
But one thing we do know is
that the answer lies
somewhere in here
The animal brain itself
So what you can see here
are a couple of pickled brains
That's a crow brain
and that's a dog brain
The dog's brain is clearly
bigger than the crow's brain
and so you might expect dogs
to be smarter than crows
But we've seen
that's not the case
Crows can solve complex
problems that dogs can't
So there must be more to
cleverness than just brain size
To explore what that might be,
Nicky's gathered a range
of preserved
animal brains collected
by Victorian naturalists
The first thing we see is
that the brains
are all different sizes
But when they're arranged
in order of the size
of the animal they come from,
we see a pattern
So, the bigger the body,
the bigger the brain
And it seems that,
in fact, the bigger the body,
the more brain you need
to control it
Most of the time, there's
a straight-line relationship
between the mass of the body
and the mass of the brain
Larger animals need more
extensive nervous systems
to coordinate
their bigger bodies
Their sense organs
are also bigger,
so they require greater amounts
of neural tissue
to process all the extra
information being gathered
You can calculate how big you'd
expect any animal's brain to be
by its body size
This is where the dog occurs
It's bang on the line,
just what you'd expect
given its body size
Most animals are more or less
on the line, but not all
Some animals sit above the line,
as we humans do
Our brains are very large
for our body mass
The difference between expected
brain size and actual brain size
is known as the encephalization
quotient, or EQ
The further above the line,
the greater the EQ
So where is the crow?
The crow's brain is
above the line,
so that means that it's
got a much bigger brain
than you'd expect
for its body size
In fact, it's twice as big
As bizarre as it may seem,
while the dog's brain is
about ten times as big as the
crow's brain in absolute size,
in relative terms, the crow's
brain is twice as big
as the dog's
So maybe evolution
has really forced them
to invest more in their brains
and that's partly
what makes them so flexible
And the crow isn't alone
in having a brain twice as big
as we'd expect
The crow is the same
distance above the line
as that of the chimpanzee
In other words,
a crow's brain,
in relative terms,
is as big as that
of a chimpanzee
These big-brained animals share
some impressive skills,
including the manufacture
of tools
This highlights another key
concept in problem solving
The ability to innovate
Alice Auersperg works
with an endearing
and inquisitive type of bird,
the Goffin's Cockatoo,
an Asian parrot
Like the crows,
these are big-brained birds,
but with a playful personality
Alice studies these animals
to find out how adept they are
at innovating
My Goffin Cockatoos
are very, very curious
So when they see an object,
for example, let's say a human,
they go for shoelaces,
watches, glasses
To investigate what's going on
in the minds of these parrots,
Alice created this, the lock box
Trapped inside is
a tasty nut securely held
behind this elaborate
locking mechanism
To see how it opens, we need
to employ the services
of a master safe-cracker...
Or Muppet, as he's known
Before Muppet begins,
any humans in the room have
to put sunglasses on
This is so the bird can't take
any cues from eye movement
Muppet has done this before
He wasn't taught by Alice,
but watched other birds do it,
and now he delivers a master
class in operating the lock box
He quickly removes the pin
Then the screw
He easily discards
the central bolt,
which in turn allows him
to shift the locking wheel
This then releases
the final bolt
And, voilà,
he's reached the nut inside
Now for the second part of the
experiment, the transfer test
After the cockatoos
had cracked the problem,
we tested whether they were only
running through a sequence
of learned behaviors or whether
they could react flexibly
to changes
To make sure Muppet hasn't
just learned the sequence
by heart, Alice can change
the lock sections around
or even remove them entirely
This creates a completely new
challenge for Muppet
Alice removes
the middle part, the bolt
With the bolt gone, the upper
section is now redundant,
leaving only the lower parts
in operation
The question is whether Muppet
can see the new problem
and work out a new solution
If he doesn't understand
how the locks work,
he'll repeat what he did before
and go for the pin at the top
If he recognizes
that the problem has changed
and that removing the pin
at the top is unnecessary,
he'll go right for the wheel
So now, the moment of truth
Muppet ignores the pin
and screw at the top
and goes straight for the wheel
And then, the bolt
And he's in,
in less than ten seconds
This is the first time Muppet's
seen this configuration
and he gets it right
Alice believes this provides
crucial insight into his mind
The birds in the transfer test
spontaneously reacted
to novel changes that they had
never encountered before
that indicates that this cannot
be trial-and-error learning
Since Muppet went straight
for the middle bolt,
it seems he has
some understanding
of how the lock system works
and can apply it
to different problems
He's one of a small group
of animals that can do this
But the problems are right
in front of them
We humans can take problem
solving a step further
We use our minds
to project into the future
And anticipate problems
before they even happen,
and plan to avoid them
It's something we long
thought only humans could do
But can these
clever animals do it, too?
There's a common behavior
in the animal world
which seems to be all
about planning for the future
It's called caching
It's what squirrels
do in autumn,
hiding nuts in the ground
so they can be dug up
and eaten in the winter
Here on the island of Santa Cruz
off the coast of California
lives a bird that has caching
down to a fine art...
The Island Scrub Jay,
another clever corvid
Mario Pesendorfer is in the
middle of a three-year project
to find out more about them
We're looking at habitat called
oak chaparral,
which is home
to the Island Scrub Jay,
and it's dominated
by these scrub oaks
And this is where the island
scrub jays get their acorns
Scrub jays love acorns
But they aren't available
all year round
On Santa Cruz,
boom time comes in autumn
when the oak trees
drop their acorns
This is when the jays get busy
They pick up the acorns and they
fly with them somewhere
and they hide them in the ground
And that's what
we call scatter hoarding
because they scatter their
hoards all over the place
So they store their food for the
winter all over their territory
and then they come and get it
back when it's raining and cold
and there's nothing else
that they can eat
Mario uses GPS
to keep an inventory
of the acorns the jays put
away in hidden caches
There's quite a few
to keep track of
In fact, each jay caches
thousands of acorns
They take out 5,000
to 6,000 acorns a year
out into this landscape
and hide them all over
in little cracks and crevices
and below other plants
But of all of these,
how many can they find again?
Of the 6,000 acorns
that they cache,
we think that they recover
about a third
These scrub jays aren't the
only corvids that cache food
Another American corvid,
the Clark's nutcracker,
caches seeds
in even greater numbers
It remembers up to 10,000
caching locations a year
quite accurately,
and they are often spaced
up to 20 kilometers
or 30 kilometers apart
The ability to remember
thousands of locations
is impressive enough
But these corvids go further
They have a sense of when they
buried each piece of food
and know when they need
to retrieve it
They know that if they hide
certain kinds of food,
they have a time frame,
that they need to get worms,
for example, faster than nuts
because worms will rot
So they have to be faster
about getting the worms
So it suggests they have
a more sophisticated idea
about the way that they are
hiding their food
But how sophisticated?
Could these birds really
have a sense of time?
It's a question that's greatly
intrigued Nicky Clayton
She studies Western Scrub-Jays,
close relatives
of the Santa Cruz birds,
also renowned
for their caching behavior
Nicky wants to discover
whether they can do more
than just remember where
and when they've buried food
in the past
If they can travel back
in their mind's eye to think
about the past,
can they also travel forward
in the mind's eye
to think about the future?
Can they plan ahead?
To find out, Nicky
creates an experiment
based on a very human
annoyance...
Waking up to find breakfast
is off the menu
For six days, the birds are
housed in this aviary,
split into three zones
In the middle is the dining room
where the birds are fed
during the day
And at either end
are the bedrooms
where they are kept at night
But there's a twist
Kept overnight in this bedroom
on the right,
the birds are served
an early breakfast
But kept overnight
in this room on the left,
they get no breakfast, and they
go hungry till mid-morning
The birds experience this daily
routine for almost a week
So we give them three lots
of experiences
of waking up in the hungry room,
and three lots of experiences
of waking up in the room
that serves breakfast
But the important point is that
the birds themselves didn't know
which room they'd end
up in on any given day
But then, Nicky starts allowing
the birds to cache food
She places trays full
of sand in both the hungry
and breakfast rooms
The birds can use these
to bury dead grubs in
The question is, where will
they choose to store the food?
Nicky wants to know if the birds
can use their experience
of the hungry and breakfast
rooms and plan for the future
For Nicky, the results are clear
The birds cache about five times
as much in the hungry room
as they cache
in the breakfast room
The scrub jays store five times
more grubs in the room
where no breakfast
is served than in the room
where they are well-fed
They can imagine what they're
going to need
the following morning
when they wake up hungry
So they can solve a problem
before it's even happened
So what this experiment shows
is that the birds can plan
for the future
Nicky believes the jays'
caching behavior is far more
than mere instinct
She thinks they
have a grasp of the past
but can also
anticipate future need
It's called mental time travel
It's the ability to go backwards
and forwards in the mind's eye
So it's about projecting
yourself in time
to remember the past
and to imagine the future
It's a skill that is very
important to us humans
We're able to remember
what we were doing yesterday,
we're able to plan
what we want to do tomorrow
And this ability to mentally
travel in time
has really allowed humans
to take over the world
in a way that no other
animal species has
In humans, mental time travel
is not a skill we're born with
It takes a while to develop
To demonstrate this,
these children are about
to undergo the candy challenge
The task is simple
Each child is given a piece
of candy
They're told
if they leave it uneaten,
then they'll get a second
one 15 minutes later
The question is
whether they'll imagine
their future selves happy
with two candies,
or will the lure of instant
gratification be too much
It's a skill that some are
clearly better at than others
I think this kind
of cognitive capacity
is highly sophisticated
We know that young
children don't start
developing these kind of skills
until they're at least
four years of age
So whether you're
a bird or a human,
mastering mental time travel
has its advantages
To solve new problems,
it really helps
if you can understand
cause and effect,
think flexibly,
apply what you've learned
to new situations,
and plan into the future
It's a rare skill set,
and the animals that have it
are a diverse group...
From the chimps
to the parrots to the corvids
So what's special
about these animals?
What could they possibly
have in common?
On the face of it, of course,
crows and chimpanzees
are very different
The key is not the physical
nature of these animals,
but the conditions that have
made them what they are
There's some common pressure,
there's something common
about the environments
or the experience
of those animals through their
life that's pushing them
to become more intelligent
These animals live in
challenging environments
Sometimes their favorite foods
aren't readily available
They have to be flexible
in order to survive
So there is definitely a
relationship between having
to find food in complicated
ways, having to deal with new,
ever-changing environments,
and those things
that we would put under
the definition of intelligence
Having a varied diet
and being flexible
in their search for food seems
to have increased their chance
for success
But there's something else
that chimps, crows
and parrots seem to share
They live in groups
When we see animals that can
solve more complex problems
than others, one of the threads
that people are excited about
is maybe it's something
about the complexity
of their social organization...
That animals that have
to deal with social complexity
are the same animals, the same
species, that are solving
many of these difficult problems
Whether they walk or fly, some
of the best problem-solvers
in the animal kingdom may
not be quite so different
from one another
as they first appear
Researchers are trying
to figure out
exactly why complex
social lives might create
better problem solvers
Could one explanation be that
the animals share knowledge?
If they come up with a good
idea, can they pass it on?
New Caledonian crows
have lots of good ideas
They are precision tool makers
This one is in the process
of crafting something
we'd normally expect
only of humans
It's making a hook
that it will use to catch prey
Alex Taylor is investigating
whether these birds are able
to share their tool making
skills with each other
What the crows have done is,
they've rounded off the end
and they've actually carved out
a tip onto the end of the tool
This tool works
as a functional hook
Now, this is really impressive
because no other species
actually makes hook tools
apart from ourselves,
not even chimpanzees
And of even more interest
to Alex are these...
Intricately cut tools
from the leaves
of the pandanus tree
Unlike the hooks, there are
distinctly different types
of pandanus tool
This is a single-step
pandanus tool
Essentially, it's a
rectangular piece of leaf
that's been cut out
from a larger piece of leaf
But the crows have gone further
than making a simple rectangle
They also make two-stepped tools
What we've got is a step
So now the end is nice and fine
so the crow can get the tool
into small areas
The third and most
elaborate type of tool
is called
a multistep pandanus tool
This tool has a series
of steps cut into it
and it has that very fine tip
and again that broad end
And across the island,
different groups
of crows use different types
of these tools
In the south, more simple
fragments are found,
but as we move north the crows
start to favor more complex,
multistepped tools
That means that different groups
of crows have their own ways
of doing things
And in human society,
we call this culture
Animals are
creating innovations,
and they're actually passing
them on to future generations
by learning from one another
And basically what
we can conclude is
that there are many species
of animals
that have simple forms
of culture
Humans are not alone
for having culture, not at all
So we're seeing
different populations
that have a single tradition
We've been collecting tools
for the last 15, 20 years
and these traditions
have persisted
So, are parents passing
down these tool designs
to their offspring?
A rare glimpse
of how this might happen
has been captured on camera
Of all the birds,
these crows have
one of the longest juvenile
periods, or childhoods
Youngsters stay with
their parents for two years
Here, an adult bird
is using a stick to probe
for grubs hidden inside a log
A juvenile stands by and watches
The adult departs and leaves
the stick in the hole
The younger bird
can now try the tool out
Although this one
has some way to go
before becoming an expert
like its parents
It looks like
one way ideas spread
through the crow population
is through family groups,
the social circle
And Alex's research
suggests something
even more extraordinary...
That with each
generation of crows,
the tools are honed and improved
The crow's tools have got
progressively better over time
As they've passed on these
tool designs between them,
they've added small tweaks
and this has made the designs
more and more efficient
The New Caledonian Crow
has only been closely studied
since the early 1990s
In that short period,
scientists have revealed
problem-solving skills
that seem similar to those
of our closest cousin,
the chimpanzee
But perhaps
the most exciting thing
is that we're just beginning
to get a glimpse into the minds
of these animals
We keep finding over and over
again that we share the planet
with other animals
that do remarkable things
that we thought only we do
And who knows what else
they might be capable of?
What really makes them tick?
Oh, look at that face!
Is there any way to get inside
the animal mind?
What I really want to know
is what is it like
to be an animal,
what's it like to be
inside their head
and what are the problems
they have to solve,
and how do they think,
and are they like us
or are they like something
totally different?
They have some amazing abilities
Is it instinct
training
or something else?
Cutting-edge animal science
reveals new answers,
getting inside their heads
in ways never before possible
Without proper training,
the dogs would just run scared
from the MRI
We put different species
to the test
in search of the roots
of animal intelligence
Who are the best
problem solvers?
Who wins the battle
of the super senses?
Dive deep into
the animal experience
to explore their language
relationships
even emotions
If you start giving
one of them grapes,
which are far better
than cucumber,
then the one who gets cucumber
becomes very upset
Are they more like us
than we ever thought possible?
Having a sense of self
might go with complex
understanding of others
On this episode
How smart is this bird brain?
Imagine that you're a crow
Here's your food in a deep hole
How would you go about
solving this problem?
They use tools
and pick locks
But what happens
in a brainy smackdown
between this bird
and man's best friend?
How did a creature
with such a tiny brain
get so smart?
A crow's brain in relative terms
is as big as that
of a chimpanzee
Why is it that that animal
can solve those problems?
Why would we observe that level
of flexibility
in that species of bird
that we don't observe
in another species?
"Inside Animal Minds:
Bird Genius,"
right now on NOVA.
We've always admired birds
for their grace and beauty
But we don't usually think
of them as incredibly bright
After all, isn't "bird-brained"
the very essence of stupidity?
But now, scientists
are discovering bird brains
that put most other animals
to shame
That's no surprise to Lloyd Buck
There it is
Lloyd handles birds
for TV and film,
and one of his stars
is a raven named Bran
There's a good boy
Well this is Bran,
and he's a three-year-old raven
We've had him since he was
about ten days old,
so he's what you call
complete social imprint
on humans, but he's
particularly bonded with me
We share a very, very close bond
Captive ravens can live
60 years or more,
so Lloyd and Bran are in
for a long-term relationship
Are you going to do it again?
But right now,
Bran wants to explore
his relationship with the camera
Going to hold finger?
No
Sorry, he likes your camera
It's the highest point
That's a good boy
To keep his demanding bird
occupied,
Lloyd gives Bran puzzles
to solve on his own
Here's a problem
Lloyd first presented to Bran
a few months ago in his aviary,
where he has a bird bath
Lloyd places a piece of food
inside a plastic bottle
and crushes it
so the food is trapped
But this doesn't stop Bran
First, he adds water
Next, he swishes it around
And the liquid carries the food
past the restriction and out
That is a clever
piece of problem solving
Good boy
You're clever
Bran wasn't taught
to solve this problem
Lloyd just gave him
the challenge one afternoon
and left Bran alone to try
to find a solution himself
So we've presented him
with that problem,
and through his own intelligence
and problem solving abilities
he worked out
to use his own water,
what he had around him
to his advantage,
which I think shows
a lot of intelligence
People who've observed crows
and ravens closely have said
that they are pretty clever
creatures
But in recent years,
new experiments
are probing deeper,
trying to solve the secrets
of their problem-solving brains
And beyond birds,
researchers are discovering
more and more animals
doing things
we once thought
were strictly human
So how smart
are these creatures?
Inside their minds,
are they analyzing
and solving problems
the way we do?
Or are these animals' skills
more like parlor tricks,
the result of training
and fueled by instinct?
What I really want to know
is what is it like
to be an animal,
what's it like to be
inside their head
and what are the problems
they have to solve,
and how do they think,
and are they like us
or are they like
something totally different?
From the beginning,
one way that humans
have solved problems has been
by using tools
It was once considered proof
of our superior intellect
But it turns out,
all kinds of animals use tools
Even an octopus...
A close relative to clams
and oysters... can do it
Off the coast of Indonesia,
this veined octopus
finds a discarded coconut shell
on the sea floor
and uses it to protect itself
from predators
First it crawls
inside the hard shell
Then it uses its eight arms
to carry it off
People used to think that
tool use was unique to humans,
but of course
that has never been the case
Ever since Darwin,
we've known that animals
have been using tools
But what's really unique
is tool manufacturing
Humans, of course, manufacture
a huge array of tools
for different purposes
And for centuries,
we thought that only humans
were smart enough to make a tool
All that changed in the 1960s,
when Jane Goodall
discovered chimpanzees
breaking all the rules
I saw this dark shape
hunched over a termite mound
He's making arm movements
as though he's sliding it
across the ground
And obviously eating
Not only did Goodall see chimps
using blades of grass as tools
to fish for termites,
but she also witnessed them
making tools by stripping leaves
off twigs
Her research supervisor
was amazed
He sent his famous reply,
"Now we have to redefine man,
redefine tool
or accept chimpanzees as humans"
Goodall's discovery
shattered our ideas
about what sets us apart from
the rest of the animal kingdom
We had to accept that animals
were smarter than we'd
given them credit for
She created basically
an environment
that we have to think
about their minds,
and we have to recognize
the fact that in many cases,
animals may have abilities
that we thought
were the province of humans
Today, animals with impressive
skills and brainpower
can be found on land
and sea
and air
And some of the most surprising
can be found here:
New Caledonia
Lying nearly 1,000 miles
east of Australia,
this remote Pacific island
is home to an animal
hailed by some as one
of the smartest on Earth,
in part because along
with humans and chimps,
it is an expert tool maker
Meet the New Caledonian Crow
In the wild,
the crows shape hooked sticks
and use them to spear grubs
But today, biologist Alex Taylor
is designing an experiment
to see if crows can use tools
in new ways to solve problems
Alex works with wild birds,
which he releases
after a three month period
This one is nicknamed 007
007's mission is to get
a tasty piece of meat
out of this narrow plastic box
What we have here
is our deep hole
This has got some meat in
The meat is positioned
so deep in the narrow box,
it's out of reach of 007's beak
But Alex has placed a number
of other objects nearby
The question is, can 007 use
them to get the piece of meat?
Imagine that you're a crow
Here's your food in a deep hole
How would you go about,
with the tools available to you
on this table,
solving this problem?
007's toolkit includes
a short stick
hanging on a piece of string,
three stones inside wooden cages
and a longer stick
trapped in a plastic box
First, the crow must use the
short stick to get the stones
And then use all three stones
to get the long stick
And now the crows can take this
and probe it into the hole
and roll...
Much better than I can...
The food out of the hole
and get themselves
a nice tasty reward
It's a complicated task
007 is familiar with the
individual pieces of the puzzle
He's done each of them
separately for a treat
For example, he's used stones
to get a piece of meat
out of the trap door box
But this is the first time
he's seen the tools
arranged like this:
eight separate stages
that must be completed
in a particular order
if the puzzle is to be solved
At first, he takes time
to check things out
Then goes for the little stick
He tries to use it
to reach the meat,
but it's too short
So he sets off
to get the first stone
Got it!
But he doesn't seem to know
what to do with it
He gets another stone
But he appears to be stuck
Now, something seems to click
He puts the first stone
into the box
where the long stick is trapped
Then the second stone
And returns to collect
the last one
He's got the long stick
and goes right for the meat
The final stage
Success
007 successfully executed
all eight tasks
to collect the out of reach
treat
How did he do it?
One of the striking things
is how skillfully 007 employs
a number of different tools
to get what he wants
That's because New Caledonian
crows are born tool-users
Auguste von Bayern
is an expert in corvids,
the family of birds
that includes crows, ravens,
jays and rooks like this one
New Caledonian crows
have evolved
with several physical features
that allow them
to more easily manipulate
objects...
Particularly sticks
New Caledonian crows are famous
for their very straight beak,
and it turns out this is
an adaptation to their tool use
This is really striking
because other corvids
have curvy beaks
You can see that very well
in the rook
The straight beak
allows the New Caledonian crow
to hold tools in front of it,
in its line of vision
But that's not all
New Caledonian crows have eyes
set closer together
than other birds,
which means there is
a significant overlap
of what their two eyes can see
This helps the crow to focus
on the end of a tool
They can see the working end
of the tool extremely well
and look into the narrow holes
and see what they're doing
Tools aren't a recent discovery
for the New Caledonian crow
They've been using them
for so long,
they have physically adapted
to tool use
No other adaptation like this
has been described
in any other tool-using animal,
so this is fairly special
So the eight stage puzzle
didn't pose
too much of a physical challenge
for the crow
But how did it figure out
which order to perform
the tasks?
What was going on in its mind?
Did it imagine the entire
solution to the puzzle?
Was it just using trial
and error step-by-step?
Was it conditioned
by its training
on the individual parts?
Or is the answer
somewhere in between?
Can animals essentially imagine
or infer or reason
about how to solve a problem
they've never seen before
and come up with a solution
that then they can act on?
On the face of it,
the crow's abilities
seem impressive
But look closely enough,
and the natural world
is filled with examples
of animals behaving
in what look like clever ways
The spider spins a web
that is precision-engineered
to catch flies
Turtles navigate
through thousands of miles
of featureless ocean,
returning to the same beaches
every year to lay eggs
It's as if they hold
a nautical map in their heads
So are the crows
really so unusual?
To begin to find out,
we need to delve
into the animal mind
and see how other animals
solve problems
Like the honeybee:
a small animal that is able
to do something
that seems incredibly smart
Insect expert Adam Hart
is interested in how bees
solve a very difficult problem
Inside a typical hive, there are
about 40,000 honeybees
Every day,
they face the challenge
of having to feed themselves
The pollen and nectar
that bees eat
is only available
when flowers are in bloom
So in spring and summer,
the bees have to collect
enough of it to eat
and enough to turn into honey
to keep the hive going
through the winter
Sometimes they can fly
more than six kilometers
to get enough
nectar and pollen back,
because they need a plentiful
and vast supply
Finding enough food is a huge
logistical challenge,
but the bees have an almost
incredible solution
Adam has set up
an observation hive
It's completely dark inside,
so infrared cameras
reveal what's going on
Initially, it looks very chaotic
It looks like bees
are everywhere
But you can see some vibrations
going on and some movements
that are actually part
of a very sophisticated
communication system
The bees perform
a striking behavior
that's key
to solving the problem
of gathering enough food
It's called the waggle dance
The waggle dance
is a very sophisticated way
of directing foragers towards
nectar in the environment
So it's telling them where to go
This bee has found
a good source of food
and she's performing a set
of very precise movements
to tell the others
exactly where to find it
It tells them the direction
and the distance of the nectar
The best way to understand how
the waggle dance actually works
is to get up high,
because then you can get
a view of the landscape
in which the bees are operating
The meaning of the waggle dance
was first proposed in the 1940s
But it wasn't proven until 2005,
when scientists were able
to track bees
using radar technology
This church tower gives Adam
a bee's eye view
of the countryside
From up here, it's easy to see
where the sun lies
over the landscape,
and where it would be
if it were on the horizon
One of the dancing bees
in the hive was waggling
at an angle of five degrees
from the vertical line
So if this tower
were a massive bee hive,
the waggle dance would be
telling us that the nectar
is five degrees
from the relative position
of the sun
But they can also
advertise distance
because the duration
of that waggle run,
that central component,
tells the bees
how far away the resource is
The closer it is,
the shorter the waggle run
So honeybees survive the winter
by using what we call geometry
They compute angles
and distances
and then transmit that
information to their hive-mates
How can a small insect
with such a tiny brain
do something
so incredibly sophisticated?
It's instinct
It's hardwired
into the bee's brain
And we know that
because if you take
older bees out of the hive,
the younger bees who have never
been exposed to a waggle dance
will spontaneously
begin waggle-dancing
and doing this behavior
It's absolutely built-in,
it's instinctive
This is an evolved behavior,
an evolved instinct,
that leads to high survival
of honeybees
Instinctive behavior
is often crucial
to the survival of a species
But the animals don't need
to have any real understanding
of what they're doing
Animal behavior often appears
very complex,
but there might be
very simple rules
underlying the pattern
that we see
So what about
the New Caledonian crow?
Researchers have found that
like bees
and their waggle-dance,
young crows will instinctively
pick up sticks with their beaks
even if they've never seen
another crow do it
But was 007 acting
just on instinct
when he solved
the eight-stage problem?
Nicky Clayton,
one of the world's
leading experts on corvids,
is convinced that
it's something more
The behavior of the
New Caledonian crow
when it's solving
one of these problems
is far more complex
than anything
that would be solved
by an instinctive mechanism
So if it isn't pure instinct,
what is it?
Scientists disagree
about what exactly is going on
in the mind of a crow like 007
or a raven like Bran
when they're solving problems
Some researchers think
the animals
are instinctive tool-users
and can be conditioned
by training
to use them in ways
that just appear clever
But others believe that animals
show real smarts
when they tackle novel problems
that they've never seen before
To demonstrate this,
we set up a little competition
to solve another puzzle
between Lloyd Buck's raven Bran
and an animal a lot of people
think of as pretty smart:
a dog
Actually, two dogs:
French poodles named
Itchy and Scratchy
It's a specially designed
puzzle box
Inside the blue ball,
there's a tasty snack
that each contestant
likes to eat:
rat meat for Bran,
a doggy treat
for Itchy and Scratchy
The challenge is to remove
the blue ball
from the two plastic boxes
First, the contenders
have the chance
to familiarize themselves
with parts of the puzzle box
As usual, Lloyd leaves Bran
to investigate on his own
Good boy
The dogs are introduced
to the components
by their owner
Itchy, concentrate, look
The outer box has a hinged door
that can be opened
by pulling on a pink ball
tied to the door with a string
Another ball and string
can then be used
to pull out the inner box
Then a third ball and string
must be pulled
to remove the lid,
freeing the blue ball
which holds the treat
And now, the moment has come
The animals are about to face
the test for the first time
This is dog versus raven
Itchy, solve this
Solve that, I'll be back
Solve it
Bran gets the tasty treat
The dogs didn't seem
to even realize
there was problem there
to solve,
despite some guidance
But Bran was so quick,
we have to use
a high-speed camera
just to see how he did it
An emphatic win for Bran
and his corvid kind
It's clear that corvids
like these have a knack
for solving problems
that involve getting food
out of hard-to-get places,
even in situations
they've never seen before
While dogs are very good
at paying attention to humans
and can be trained
to carry out complicated tasks,
they're not so good
at tackling novel problems
like this one,
despite the fact
that there's food involved
Why is it that that animal
can solve those problems?
Why would we observe
that level of flexibility
in that species of bird
that we don't observe
in another species?
Here at Cambridge University
in England,
Nicky Clayton is trying
to find out
how the corvid mind works
She sets up experiments
to break down
the different abilities
these birds use
to solve problems
And she gives one of them...
A Eurasian jay named Hoy...
A particular challenge
First, he's presented
with a plastic tube
When he puts a rock
in at the top,
a tasty food reward... a worm...
Comes out at the bottom
When he's got the hang of that,
Nicky gives him a new test
She drops some worms...
His favorite food...
Into a tube of water
out of reach,
and leaves a pile of stones
next to it
There's a delicious, tasty worm
floating on the top
At the moment, it's out of reach
Then, Hoy picks up a stone
and drops it in the tube
Does Hoy actually understand
that a sinking stone
will cause the water level
to rise,
and this in turn will allow him
to reach the worm?
When Nicky gives him
the same tube,
but this time with the worm
sitting on sand instead of water
Hoy does not use the stones
Nicky believes he understands
the difference
He seems to understand
that it's only any good
if there's a liquid in the tube
It's a very useful skill
when it comes
to solving problems:
the ability to make a connection
between cause... the stone...
And effect...
The rising water level
Cause and effect is the ability
to understand what causes what,
why did a particular
event occur,
if you can identify that
so you know what causes it
And that means as humans,
we're able to recreate
that same cause
to get that same effect,
and that's a really
powerful skill
To figure out step one,
putting stones in the tube,
Hoy took the knowledge
from the training task
and transferred it
to the new one
This is another skill
many corvids display
when tackling problems:
the ability to think flexibly,
to use information learned
in one situation
and apply it to another
Flexible thinking is the ability
to transfer information,
knowledge, from one problem
to a brand new problem
So it's applying knowledge
to new contexts
And this is how
the New Caledonian crow
solved the multistage problem
New Caledonian crows
need flexibility
in their environment they
evolved in to process food,
and to be able to get access
to food in new ways using tools
in settings they may not
have encountered before
This also explains how Bran
quickly solved the puzzle box
The birds were thinking
flexibly, an ability
that seems to be missing in dogs
So why are some animals better
at solving problems than others?
It's something we don't
yet fully understand
But one thing we do know is
that the answer lies
somewhere in here
The animal brain itself
So what you can see here
are a couple of pickled brains
That's a crow brain
and that's a dog brain
The dog's brain is clearly
bigger than the crow's brain
and so you might expect dogs
to be smarter than crows
But we've seen
that's not the case
Crows can solve complex
problems that dogs can't
So there must be more to
cleverness than just brain size
To explore what that might be,
Nicky's gathered a range
of preserved
animal brains collected
by Victorian naturalists
The first thing we see is
that the brains
are all different sizes
But when they're arranged
in order of the size
of the animal they come from,
we see a pattern
So, the bigger the body,
the bigger the brain
And it seems that,
in fact, the bigger the body,
the more brain you need
to control it
Most of the time, there's
a straight-line relationship
between the mass of the body
and the mass of the brain
Larger animals need more
extensive nervous systems
to coordinate
their bigger bodies
Their sense organs
are also bigger,
so they require greater amounts
of neural tissue
to process all the extra
information being gathered
You can calculate how big you'd
expect any animal's brain to be
by its body size
This is where the dog occurs
It's bang on the line,
just what you'd expect
given its body size
Most animals are more or less
on the line, but not all
Some animals sit above the line,
as we humans do
Our brains are very large
for our body mass
The difference between expected
brain size and actual brain size
is known as the encephalization
quotient, or EQ
The further above the line,
the greater the EQ
So where is the crow?
The crow's brain is
above the line,
so that means that it's
got a much bigger brain
than you'd expect
for its body size
In fact, it's twice as big
As bizarre as it may seem,
while the dog's brain is
about ten times as big as the
crow's brain in absolute size,
in relative terms, the crow's
brain is twice as big
as the dog's
So maybe evolution
has really forced them
to invest more in their brains
and that's partly
what makes them so flexible
And the crow isn't alone
in having a brain twice as big
as we'd expect
The crow is the same
distance above the line
as that of the chimpanzee
In other words,
a crow's brain,
in relative terms,
is as big as that
of a chimpanzee
These big-brained animals share
some impressive skills,
including the manufacture
of tools
This highlights another key
concept in problem solving
The ability to innovate
Alice Auersperg works
with an endearing
and inquisitive type of bird,
the Goffin's Cockatoo,
an Asian parrot
Like the crows,
these are big-brained birds,
but with a playful personality
Alice studies these animals
to find out how adept they are
at innovating
My Goffin Cockatoos
are very, very curious
So when they see an object,
for example, let's say a human,
they go for shoelaces,
watches, glasses
To investigate what's going on
in the minds of these parrots,
Alice created this, the lock box
Trapped inside is
a tasty nut securely held
behind this elaborate
locking mechanism
To see how it opens, we need
to employ the services
of a master safe-cracker...
Or Muppet, as he's known
Before Muppet begins,
any humans in the room have
to put sunglasses on
This is so the bird can't take
any cues from eye movement
Muppet has done this before
He wasn't taught by Alice,
but watched other birds do it,
and now he delivers a master
class in operating the lock box
He quickly removes the pin
Then the screw
He easily discards
the central bolt,
which in turn allows him
to shift the locking wheel
This then releases
the final bolt
And, voilà,
he's reached the nut inside
Now for the second part of the
experiment, the transfer test
After the cockatoos
had cracked the problem,
we tested whether they were only
running through a sequence
of learned behaviors or whether
they could react flexibly
to changes
To make sure Muppet hasn't
just learned the sequence
by heart, Alice can change
the lock sections around
or even remove them entirely
This creates a completely new
challenge for Muppet
Alice removes
the middle part, the bolt
With the bolt gone, the upper
section is now redundant,
leaving only the lower parts
in operation
The question is whether Muppet
can see the new problem
and work out a new solution
If he doesn't understand
how the locks work,
he'll repeat what he did before
and go for the pin at the top
If he recognizes
that the problem has changed
and that removing the pin
at the top is unnecessary,
he'll go right for the wheel
So now, the moment of truth
Muppet ignores the pin
and screw at the top
and goes straight for the wheel
And then, the bolt
And he's in,
in less than ten seconds
This is the first time Muppet's
seen this configuration
and he gets it right
Alice believes this provides
crucial insight into his mind
The birds in the transfer test
spontaneously reacted
to novel changes that they had
never encountered before
that indicates that this cannot
be trial-and-error learning
Since Muppet went straight
for the middle bolt,
it seems he has
some understanding
of how the lock system works
and can apply it
to different problems
He's one of a small group
of animals that can do this
But the problems are right
in front of them
We humans can take problem
solving a step further
We use our minds
to project into the future
And anticipate problems
before they even happen,
and plan to avoid them
It's something we long
thought only humans could do
But can these
clever animals do it, too?
There's a common behavior
in the animal world
which seems to be all
about planning for the future
It's called caching
It's what squirrels
do in autumn,
hiding nuts in the ground
so they can be dug up
and eaten in the winter
Here on the island of Santa Cruz
off the coast of California
lives a bird that has caching
down to a fine art...
The Island Scrub Jay,
another clever corvid
Mario Pesendorfer is in the
middle of a three-year project
to find out more about them
We're looking at habitat called
oak chaparral,
which is home
to the Island Scrub Jay,
and it's dominated
by these scrub oaks
And this is where the island
scrub jays get their acorns
Scrub jays love acorns
But they aren't available
all year round
On Santa Cruz,
boom time comes in autumn
when the oak trees
drop their acorns
This is when the jays get busy
They pick up the acorns and they
fly with them somewhere
and they hide them in the ground
And that's what
we call scatter hoarding
because they scatter their
hoards all over the place
So they store their food for the
winter all over their territory
and then they come and get it
back when it's raining and cold
and there's nothing else
that they can eat
Mario uses GPS
to keep an inventory
of the acorns the jays put
away in hidden caches
There's quite a few
to keep track of
In fact, each jay caches
thousands of acorns
They take out 5,000
to 6,000 acorns a year
out into this landscape
and hide them all over
in little cracks and crevices
and below other plants
But of all of these,
how many can they find again?
Of the 6,000 acorns
that they cache,
we think that they recover
about a third
These scrub jays aren't the
only corvids that cache food
Another American corvid,
the Clark's nutcracker,
caches seeds
in even greater numbers
It remembers up to 10,000
caching locations a year
quite accurately,
and they are often spaced
up to 20 kilometers
or 30 kilometers apart
The ability to remember
thousands of locations
is impressive enough
But these corvids go further
They have a sense of when they
buried each piece of food
and know when they need
to retrieve it
They know that if they hide
certain kinds of food,
they have a time frame,
that they need to get worms,
for example, faster than nuts
because worms will rot
So they have to be faster
about getting the worms
So it suggests they have
a more sophisticated idea
about the way that they are
hiding their food
But how sophisticated?
Could these birds really
have a sense of time?
It's a question that's greatly
intrigued Nicky Clayton
She studies Western Scrub-Jays,
close relatives
of the Santa Cruz birds,
also renowned
for their caching behavior
Nicky wants to discover
whether they can do more
than just remember where
and when they've buried food
in the past
If they can travel back
in their mind's eye to think
about the past,
can they also travel forward
in the mind's eye
to think about the future?
Can they plan ahead?
To find out, Nicky
creates an experiment
based on a very human
annoyance...
Waking up to find breakfast
is off the menu
For six days, the birds are
housed in this aviary,
split into three zones
In the middle is the dining room
where the birds are fed
during the day
And at either end
are the bedrooms
where they are kept at night
But there's a twist
Kept overnight in this bedroom
on the right,
the birds are served
an early breakfast
But kept overnight
in this room on the left,
they get no breakfast, and they
go hungry till mid-morning
The birds experience this daily
routine for almost a week
So we give them three lots
of experiences
of waking up in the hungry room,
and three lots of experiences
of waking up in the room
that serves breakfast
But the important point is that
the birds themselves didn't know
which room they'd end
up in on any given day
But then, Nicky starts allowing
the birds to cache food
She places trays full
of sand in both the hungry
and breakfast rooms
The birds can use these
to bury dead grubs in
The question is, where will
they choose to store the food?
Nicky wants to know if the birds
can use their experience
of the hungry and breakfast
rooms and plan for the future
For Nicky, the results are clear
The birds cache about five times
as much in the hungry room
as they cache
in the breakfast room
The scrub jays store five times
more grubs in the room
where no breakfast
is served than in the room
where they are well-fed
They can imagine what they're
going to need
the following morning
when they wake up hungry
So they can solve a problem
before it's even happened
So what this experiment shows
is that the birds can plan
for the future
Nicky believes the jays'
caching behavior is far more
than mere instinct
She thinks they
have a grasp of the past
but can also
anticipate future need
It's called mental time travel
It's the ability to go backwards
and forwards in the mind's eye
So it's about projecting
yourself in time
to remember the past
and to imagine the future
It's a skill that is very
important to us humans
We're able to remember
what we were doing yesterday,
we're able to plan
what we want to do tomorrow
And this ability to mentally
travel in time
has really allowed humans
to take over the world
in a way that no other
animal species has
In humans, mental time travel
is not a skill we're born with
It takes a while to develop
To demonstrate this,
these children are about
to undergo the candy challenge
The task is simple
Each child is given a piece
of candy
They're told
if they leave it uneaten,
then they'll get a second
one 15 minutes later
The question is
whether they'll imagine
their future selves happy
with two candies,
or will the lure of instant
gratification be too much
It's a skill that some are
clearly better at than others
I think this kind
of cognitive capacity
is highly sophisticated
We know that young
children don't start
developing these kind of skills
until they're at least
four years of age
So whether you're
a bird or a human,
mastering mental time travel
has its advantages
To solve new problems,
it really helps
if you can understand
cause and effect,
think flexibly,
apply what you've learned
to new situations,
and plan into the future
It's a rare skill set,
and the animals that have it
are a diverse group...
From the chimps
to the parrots to the corvids
So what's special
about these animals?
What could they possibly
have in common?
On the face of it, of course,
crows and chimpanzees
are very different
The key is not the physical
nature of these animals,
but the conditions that have
made them what they are
There's some common pressure,
there's something common
about the environments
or the experience
of those animals through their
life that's pushing them
to become more intelligent
These animals live in
challenging environments
Sometimes their favorite foods
aren't readily available
They have to be flexible
in order to survive
So there is definitely a
relationship between having
to find food in complicated
ways, having to deal with new,
ever-changing environments,
and those things
that we would put under
the definition of intelligence
Having a varied diet
and being flexible
in their search for food seems
to have increased their chance
for success
But there's something else
that chimps, crows
and parrots seem to share
They live in groups
When we see animals that can
solve more complex problems
than others, one of the threads
that people are excited about
is maybe it's something
about the complexity
of their social organization...
That animals that have
to deal with social complexity
are the same animals, the same
species, that are solving
many of these difficult problems
Whether they walk or fly, some
of the best problem-solvers
in the animal kingdom may
not be quite so different
from one another
as they first appear
Researchers are trying
to figure out
exactly why complex
social lives might create
better problem solvers
Could one explanation be that
the animals share knowledge?
If they come up with a good
idea, can they pass it on?
New Caledonian crows
have lots of good ideas
They are precision tool makers
This one is in the process
of crafting something
we'd normally expect
only of humans
It's making a hook
that it will use to catch prey
Alex Taylor is investigating
whether these birds are able
to share their tool making
skills with each other
What the crows have done is,
they've rounded off the end
and they've actually carved out
a tip onto the end of the tool
This tool works
as a functional hook
Now, this is really impressive
because no other species
actually makes hook tools
apart from ourselves,
not even chimpanzees
And of even more interest
to Alex are these...
Intricately cut tools
from the leaves
of the pandanus tree
Unlike the hooks, there are
distinctly different types
of pandanus tool
This is a single-step
pandanus tool
Essentially, it's a
rectangular piece of leaf
that's been cut out
from a larger piece of leaf
But the crows have gone further
than making a simple rectangle
They also make two-stepped tools
What we've got is a step
So now the end is nice and fine
so the crow can get the tool
into small areas
The third and most
elaborate type of tool
is called
a multistep pandanus tool
This tool has a series
of steps cut into it
and it has that very fine tip
and again that broad end
And across the island,
different groups
of crows use different types
of these tools
In the south, more simple
fragments are found,
but as we move north the crows
start to favor more complex,
multistepped tools
That means that different groups
of crows have their own ways
of doing things
And in human society,
we call this culture
Animals are
creating innovations,
and they're actually passing
them on to future generations
by learning from one another
And basically what
we can conclude is
that there are many species
of animals
that have simple forms
of culture
Humans are not alone
for having culture, not at all
So we're seeing
different populations
that have a single tradition
We've been collecting tools
for the last 15, 20 years
and these traditions
have persisted
So, are parents passing
down these tool designs
to their offspring?
A rare glimpse
of how this might happen
has been captured on camera
Of all the birds,
these crows have
one of the longest juvenile
periods, or childhoods
Youngsters stay with
their parents for two years
Here, an adult bird
is using a stick to probe
for grubs hidden inside a log
A juvenile stands by and watches
The adult departs and leaves
the stick in the hole
The younger bird
can now try the tool out
Although this one
has some way to go
before becoming an expert
like its parents
It looks like
one way ideas spread
through the crow population
is through family groups,
the social circle
And Alex's research
suggests something
even more extraordinary...
That with each
generation of crows,
the tools are honed and improved
The crow's tools have got
progressively better over time
As they've passed on these
tool designs between them,
they've added small tweaks
and this has made the designs
more and more efficient
The New Caledonian Crow
has only been closely studied
since the early 1990s
In that short period,
scientists have revealed
problem-solving skills
that seem similar to those
of our closest cousin,
the chimpanzee
But perhaps
the most exciting thing
is that we're just beginning
to get a glimpse into the minds
of these animals
We keep finding over and over
again that we share the planet
with other animals
that do remarkable things
that we thought only we do
And who knows what else
they might be capable of?