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The world's oceans
are full of wonder...

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an alien world
waiting to be explored...

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♪

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...a place of
extraordinary life-forms...

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with intriguing social lives...

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[ Dolphin squeaking ]
...and incredible intelligence.

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To reveal their secrets,
a hidden team goes undercover.

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♪
To reveal their secrets,
a hidden team goes undercover.

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Spy Creatures.

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♪

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The most innovative
undersea robots in the world.

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♪

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They not only look like
the animals they film.

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They interact with them
as no human can.

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♪

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Equipped with hidden cameras...

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♪

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...they reveal
their astonishing lives.

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♪

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As our spies join
their undersea world...

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they shed light on some of
the mysteries of the deep.

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♪

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As our spies search the ocean
for intelligent life,

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they find ways of thinking

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that must be seen
to be believed.

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♪

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A family of sperm whales,

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the most intelligent creatures
in the ocean...

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♪

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...and owners of the largest
brains on the planet.

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♪

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These intellectual giants
show a social intelligence

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that appears similar to our own.

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♪

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To gain insights
into their minds,

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a spy is sent among them...

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♪

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...an autonomous submersible
programmed to follow the whales.

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♪

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At over 3 metres long,

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it's the same size
as a newborn whale,

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large enough to hide
an array of cameras...

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♪

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...but small enough to arouse

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the maternal interest
of a female.

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♪

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Her curiosity hints
at what she may be thinking...

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♪

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...a desire to reach out
and make friends.

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♪

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Seen through the camera eye
of our spy...

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♪

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...a meeting
with a sentient mind.

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♪

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♪

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A first contact

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with an inquisitive
and questioning being.

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♪

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Our spy's hydrophones

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now capture
something extraordinary...

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[ Whale clicking ]

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She attempts to communicate.

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♪

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Another sign
of her social intelligence.

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♪

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She uses the same clicks
when greeting other whales.

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♪

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Her open jaw means

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she's introducing herself
to our spy.

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[ Clicking continues ]

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♪

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♪

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Waiting in the wings is a calf.

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♪

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In a touching sign of approval,

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she invites the youngster
to meet our spy creature.

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♪

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An encounter far closer
than ever imagined.

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♪

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The camera even reveals
his hitchhiking companions.

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♪

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Harmless remora fish...
enjoying a free ride.

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♪

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♪

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Our spy is gaining an insight

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into how relationships form
among whales.

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♪

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Being allowed so close
is a sign of acceptance.

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♪

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The mother is so trusting,

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she leaves her calf
and heads to the ocean depths.

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♪

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She'll dive
nearly 2 miles below...

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♪

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...leaving a friend
to look after her calf.

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Spy Whale seems
to be welcome, too.

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Together,
they'll stay with the calf

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until the mother returns.

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♪

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Our spy is now perfectly placed
to discover more

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about the social intelligence
of the whales.

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♪

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In the coral reefs of Indonesia,

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there are more intelligent
life-forms to be found.

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♪

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The smartest of all
is the coconut octopus.

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♪

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As well as a main brain
in its body,

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each of its eight arms
has a brain of its own.

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♪

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All nine brains
can think for themselves,

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or even think as one
when required.

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♪

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To help fathom it out,
another spy is needed...

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...one programmed to walk
in a similar way.

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Its aim is to communicate
with the octopus...

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...to find out
how clever it really is.

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What must he be thinking?

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Then, a clue.

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He's working out
whether it's friend or a foe.

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It seems our spy is a friend.

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♪

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Just as well.

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He certainly
has plenty of enemies.

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♪

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His soft body means
everyone's out to get him.

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♪

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And not just him.

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♪

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Such dangers are small-fry

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compared with
the oceans' top predators.

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Blacktip sharks hunt octopus.

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♪

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Fortunately, our spy
doesn't smell like one.

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♪

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Not so, the real thing.

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He may hide,
but they could still find him.

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♪

139
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♪

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Time for some quick thinking.

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A hollow bamboo shows promise.

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♪

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♪

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But its open entrance
is far from ideal.

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♪

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Our spy may have the answer.

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It's just what
the octopus needs.

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But will he dare
take it from him?

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♪

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♪

151
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Like a seasoned thief,

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he tries to avoid
raising suspicion.

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♪

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Being aware of what others
could be thinking

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is a sign of deep intelligence.

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♪

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♪

158
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♪

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A perfect fit!

160
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And just in time!

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♪

162
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♪

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With nothing worth eating,
the sharks move on.

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♪

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The coconut octopus
need hide no more.

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♪

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As a sign of acceptance,
he shows his true feelings.

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♪

169
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As their relationship grows,

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there'll be plenty more
to discover.

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♪

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[ Macaques screeching ]

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Of all seagoers,

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few are cleverer
than these Thailand macaques.

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Spy Macaque is discovering

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how they survive
on this remote island.

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It, too, has a camera
in its eye.

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[ Macaques screeching ]

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It can not only film
above the surface,

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but underwater, too.

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As well as being able to swim,

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it has a fully waterproof
camera eye,

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perfect for filming
these free divers

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searching for shellfish.

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♪

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They can hold their breath
for a minute or more.

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♪

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♪

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When they come up for air,
there's more seafood to find.

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♪

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Our spy has acquired Spy Oyster.

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Together, they capture
a filming first.

193
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These monkeys have gone fishing,

194
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grabbing whatever
is trapped in the pools.

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[ Macaques screeching ]

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It takes
quick-witted reactions...

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...and a firm grip.

198
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Fish course over,

199
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there's more seafood
on the menu...

200
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...oysters embedded
in the rocks.

201
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They can't be removed
by brute force alone.

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It's a task only the best minds
can crack...

203
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...those that can wield a tool.

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[ Macaque screeches ]

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A treat worth the effort.

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♪

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Finding the right rock
is a knack.

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♪

209
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♪

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It must be
the correct weight and size.

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♪

212
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Like this one,
designed for the job in hand.

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♪

214
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Even so, he must be careful.

215
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♪

216
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One slip could be nasty.

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♪

218
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It's the perfect tool...

219
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...or was.

220
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♪

221
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Oh, well.

222
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Knowledge comes with experience.

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It starts
with a sense of curiosity.

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But others are curious, too.

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♪

226
00:16:13,360 --> 00:16:15,600
Climbing with a spy cam
isn't easy.

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♪

228
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Whoops!

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No bother.

230
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If you're smart,
you know how to have fun.

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♪

232
00:16:35,840 --> 00:16:42,760
♪

233
00:16:42,920 --> 00:16:45,760
A chance to make friends
and let off steam.

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00:16:45,920 --> 00:16:48,520
[ Macaques screeching ]

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00:16:48,680 --> 00:16:55,160
♪

236
00:16:55,320 --> 00:16:57,120
As our spies found,

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macaques, cast away
on a remote island,

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have found clever ways to adapt.

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00:17:02,600 --> 00:17:05,040
♪

240
00:17:05,200 --> 00:17:09,440
Creative thinking can also
be used to find a mate.

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In the Sea of Japan,

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there's even a sea creature
who creates works of art.

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♪

244
00:17:22,760 --> 00:17:25,880
Spy Pufferfish
is on a mission to find it.

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♪

246
00:17:31,400 --> 00:17:34,080
The artist in residence
won't be found among the coral.

247
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♪

248
00:17:36,560 --> 00:17:40,480
It needs a blank canvas
to work with...

249
00:17:40,640 --> 00:17:43,440
something only the sand provides.

250
00:17:43,600 --> 00:17:47,560
♪

251
00:17:47,720 --> 00:17:50,160
And here it is,

252
00:17:50,320 --> 00:17:54,760
An exquisite sand sculpture
found nowhere else on earth.

253
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♪

254
00:18:04,080 --> 00:18:13,160
♪

255
00:18:13,320 --> 00:18:16,840
The artist at work is
a male Japanese pufferfish.

256
00:18:17,000 --> 00:18:22,840
♪

257
00:18:25,160 --> 00:18:28,000
He's designed his masterpiece
to lure in a mate.

258
00:18:35,520 --> 00:18:39,080
An artistic creation
to delight a female's eye.

259
00:18:47,640 --> 00:18:49,840
He uses a fin
to plough a furrow...

260
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...while other fins
sweep the sand into ridges.

261
00:18:59,840 --> 00:19:03,160
The gullies channel the finest
particles towards the centre.

262
00:19:08,280 --> 00:19:12,840
The result is a fully functional
work of art.

263
00:19:13,000 --> 00:19:14,920
It's now Spy Puffer's turn.

264
00:19:15,080 --> 00:19:17,560
[ Whirring ]

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♪

266
00:19:23,880 --> 00:19:30,000
♪

267
00:19:30,160 --> 00:19:32,640
Artworks are best viewed
at a distance.

268
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♪

269
00:19:42,200 --> 00:19:44,320
Oh, dear.

270
00:19:49,240 --> 00:19:51,800
Nothing compares
to the true artist.

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00:19:51,960 --> 00:19:59,960
♪

272
00:20:00,120 --> 00:20:01,960
The female will decide.

273
00:20:02,120 --> 00:20:04,920
♪

274
00:20:05,080 --> 00:20:08,120
Spy Puffer's creation
is hardly worth a second look.

275
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♪

276
00:20:13,040 --> 00:20:15,000
She's after a masterpiece.

277
00:20:21,800 --> 00:20:24,120
But for this discerning
art critic,

278
00:20:24,280 --> 00:20:26,040
there's still room
for improvement...

279
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...especially when some debris
spoils the design...

280
00:20:34,560 --> 00:20:37,200
...a blemish easily dealt with
by the male.

281
00:20:44,920 --> 00:20:49,360
But it still needs
some finishing touches,

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00:20:49,520 --> 00:20:52,480
such as shells
to decorate the ridges.

283
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They're more than
an artistic flourish.

284
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They stabilise the ridges,

285
00:21:02,480 --> 00:21:04,880
slowing the water
that might stir the centre...

286
00:21:07,960 --> 00:21:11,360
...for this is where the female
will lay her eggs.

287
00:21:13,280 --> 00:21:15,440
But the male
has run out of shells,

288
00:21:15,600 --> 00:21:17,960
and the female
is losing interest.

289
00:21:21,880 --> 00:21:24,560
Spy Puffer becomes
the artist's assistant.

290
00:21:24,720 --> 00:21:33,600
♪

291
00:21:33,760 --> 00:21:35,600
The finishing touch he needs.

292
00:21:35,760 --> 00:21:42,200
♪

293
00:21:42,360 --> 00:21:48,800
♪

294
00:21:48,960 --> 00:21:51,440
All this striving
for artistic perfection

295
00:21:51,600 --> 00:21:53,320
is a test of his fitness.

296
00:21:53,480 --> 00:21:58,640
♪

297
00:21:58,800 --> 00:22:01,600
Satisfied with
the aesthetic details,

298
00:22:01,760 --> 00:22:03,680
the female enters the nest.

299
00:22:03,840 --> 00:22:08,920
♪

300
00:22:09,080 --> 00:22:11,480
They join together,
cheek-to-cheek.

301
00:22:11,640 --> 00:22:17,720
♪

302
00:22:17,880 --> 00:22:19,520
Then, quick as a flash,

303
00:22:19,680 --> 00:22:22,080
the eggs are laid
and fertilised.

304
00:22:22,240 --> 00:22:26,320
♪

305
00:22:26,480 --> 00:22:28,600
With a little help
from Spy Puffer,

306
00:22:28,760 --> 00:22:31,880
the next generation of artists
is secure.

307
00:22:38,520 --> 00:22:40,920
While pufferfish
think creatively,

308
00:22:41,080 --> 00:22:44,640
fish shoals all think together.

309
00:22:44,800 --> 00:22:48,440
They show swarm intelligence,
moving as one

310
00:22:48,600 --> 00:22:51,080
as they mirror the moves
of their nearest neighbours.

311
00:22:56,280 --> 00:23:00,240
Their group thinking is about
to be tested by smarter minds.

312
00:23:00,400 --> 00:23:03,720
♪

313
00:23:03,880 --> 00:23:06,720
Marlin...

314
00:23:06,880 --> 00:23:09,440
one of the ocean's
fastest predators.

315
00:23:09,600 --> 00:23:11,480
♪

316
00:23:11,640 --> 00:23:16,560
They use teamwork to drive
mackerel up from the depths,

317
00:23:16,720 --> 00:23:21,480
forcing them to the surface
in ever-tighter balls.

318
00:23:21,640 --> 00:23:24,240
They are not alone.

319
00:23:24,400 --> 00:23:26,440
Sea lions soon join
the gathering.

320
00:23:26,600 --> 00:23:30,080
♪

321
00:23:30,240 --> 00:23:34,120
Among them
is a new spy creature--

322
00:23:34,280 --> 00:23:37,800
Spy Sea Lion.

323
00:23:37,960 --> 00:23:39,520
Like the real thing,

324
00:23:39,680 --> 00:23:42,880
its flexible body lets it
manoeuvre among the shoals.

325
00:23:43,040 --> 00:23:52,480
♪

326
00:23:52,640 --> 00:23:55,240
Its eye cams
gain a sea lion's view

327
00:23:55,400 --> 00:23:57,360
as the marlin spear their prey.

328
00:23:57,520 --> 00:24:03,120
♪

329
00:24:03,280 --> 00:24:04,920
Like master swordsmen,

330
00:24:05,080 --> 00:24:07,960
they use their metre-long bills
as deadly weapons.

331
00:24:08,120 --> 00:24:15,120
♪

332
00:24:15,280 --> 00:24:19,280
As the hunt continues,
our spy films an insider's view.

333
00:24:23,360 --> 00:24:25,320
It won't be working alone.

334
00:24:27,400 --> 00:24:30,720
As frigate birds gather,
another spy joins...

335
00:24:33,760 --> 00:24:36,680
...one that captures the
marlins' skills from the air.

336
00:24:43,120 --> 00:24:46,840
They corral the shoal,
concentrating the ball,

337
00:24:47,000 --> 00:24:49,600
letting them pick off
the fish on the outside.

338
00:24:52,240 --> 00:24:54,000
But they don't have it all
their own way.

339
00:24:54,160 --> 00:24:57,600
[ Whirring ]

340
00:24:57,760 --> 00:24:59,920
The marlin
will soon be competing

341
00:25:00,080 --> 00:25:02,800
with those with
far greater intelligence.

342
00:25:05,400 --> 00:25:07,400
♪

343
00:25:07,560 --> 00:25:10,520
Spy Sea Lion
now has plenty of company.

344
00:25:10,680 --> 00:25:12,840
♪

345
00:25:13,000 --> 00:25:15,680
They are here in their hundreds.

346
00:25:15,840 --> 00:25:20,640
♪

347
00:25:20,800 --> 00:25:22,200
Working together,

348
00:25:22,360 --> 00:25:24,760
they steal the bait ball
from the marlin.

349
00:25:29,000 --> 00:25:32,880
Seen through the camera eye
of our spy,

350
00:25:33,040 --> 00:25:36,800
our spy reveals what happens
once the sea lions take over.

351
00:25:39,480 --> 00:25:42,280
It joins them as they unite
to split the ball...

352
00:25:45,720 --> 00:25:49,400
...capturing a sea lion's view
from inside the shoal.

353
00:25:52,200 --> 00:25:54,680
It shows how the fish
move as one.

354
00:26:00,720 --> 00:26:02,400
Its swarm intelligence

355
00:26:02,560 --> 00:26:04,440
pitched against
that of the sea lions'.

356
00:26:07,600 --> 00:26:10,480
This is where true intelligence
shows its worth.

357
00:26:13,960 --> 00:26:17,400
They work together
to force the shoal apart.

358
00:26:17,560 --> 00:26:19,880
They can now pick off
the weak and injured.

359
00:26:20,040 --> 00:26:24,400
♪

360
00:26:24,560 --> 00:26:28,000
Sea lions can eat
15 kilos of fish a day.

361
00:26:28,160 --> 00:26:31,600
♪

362
00:26:31,760 --> 00:26:35,360
But such a colossal bait ball
is too much, even for them.

363
00:26:35,520 --> 00:26:38,160
♪

364
00:26:38,320 --> 00:26:40,920
They start to play with
their food rather than eat it.

365
00:26:41,080 --> 00:26:46,320
♪

366
00:26:46,480 --> 00:26:48,560
Then, something unexpected.

367
00:26:48,720 --> 00:26:54,600
♪

368
00:26:54,760 --> 00:26:57,520
They gift the leftovers
to the hungry marlin.

369
00:26:57,680 --> 00:27:05,240
♪

370
00:27:05,400 --> 00:27:07,560
There's even a fish
for Spy Sea Lion.

371
00:27:07,720 --> 00:27:16,040
♪

372
00:27:16,200 --> 00:27:19,760
Not much use to our spy.

373
00:27:19,920 --> 00:27:21,920
It is to the marlin.

374
00:27:22,080 --> 00:27:25,160
♪

375
00:27:25,320 --> 00:27:30,040
The sea lions may have
outsmarted swarm intelligence,

376
00:27:30,200 --> 00:27:32,680
but even they can be beaten
by a bigger power.

377
00:27:32,840 --> 00:27:40,160
♪

378
00:27:40,320 --> 00:27:43,920
A Bryde's whale will make
short work of what they've left.

379
00:27:44,080 --> 00:27:50,280
♪

380
00:27:54,600 --> 00:27:57,040
Back on the reef,
there are more insights

381
00:27:57,200 --> 00:27:59,360
to be gained
from the coconut octopus.

382
00:28:09,160 --> 00:28:12,760
Spy Octopus is still nurturing
its newfound relationship.

383
00:28:22,600 --> 00:28:24,880
Their bond
has only grown stronger.

384
00:28:29,800 --> 00:28:32,120
To feed,
he must leave his hideaway.

385
00:28:41,680 --> 00:28:44,600
As a precaution, he takes
the coconut shell with him.

386
00:28:54,080 --> 00:28:56,520
What was once
the door to his refuge

387
00:28:56,680 --> 00:28:58,520
is now a mobile home.

388
00:28:58,680 --> 00:29:06,680
♪

389
00:29:06,840 --> 00:29:15,120
♪

390
00:29:15,280 --> 00:29:17,360
But there are more surprises
in store.

391
00:29:17,520 --> 00:29:19,520
♪

392
00:29:19,680 --> 00:29:24,440
The octopus is still looking
to improve his security.

393
00:29:24,600 --> 00:29:27,560
Some armour plating
wouldn't go amiss.

394
00:29:31,400 --> 00:29:33,360
A shell would be perfect.

395
00:29:47,280 --> 00:29:49,920
His only problem
is carrying it all.

396
00:29:50,080 --> 00:29:56,520
♪

397
00:29:56,680 --> 00:30:03,320
♪

398
00:30:03,480 --> 00:30:06,120
This is taking defence seriously.

399
00:30:06,280 --> 00:30:13,240
♪

400
00:30:13,400 --> 00:30:14,960
All bases covered,

401
00:30:15,120 --> 00:30:17,520
he's perfectly placed
to stage an ambush.

402
00:30:26,960 --> 00:30:28,960
And what better than a crab?

403
00:30:32,080 --> 00:30:34,240
The chase is on!

404
00:30:34,400 --> 00:30:38,240
♪

405
00:30:38,400 --> 00:30:41,000
But the crab
has a trick of its own.

406
00:30:41,160 --> 00:30:43,760
it heads to the surface.

407
00:30:43,920 --> 00:30:46,280
So does the octopus.

408
00:30:46,440 --> 00:30:53,640
♪

409
00:30:53,800 --> 00:30:55,800
He makes a grab!

410
00:30:55,960 --> 00:31:03,240
♪

411
00:31:03,400 --> 00:31:06,200
It's firmly in his grasp,
but he must eat quickly.

412
00:31:09,880 --> 00:31:11,960
He's being watched.

413
00:31:13,840 --> 00:31:16,040
A rival coconut octopus.

414
00:31:19,160 --> 00:31:21,160
His colour change
shows he means business.

415
00:31:21,320 --> 00:31:28,400
♪

416
00:31:28,560 --> 00:31:31,000
To up the ante,
he makes himself bigger.

417
00:31:31,160 --> 00:31:35,600
♪

418
00:31:35,760 --> 00:31:39,800
But the octopus
stands his ground...

419
00:31:39,960 --> 00:31:42,360
before firing a salvo of shells.

420
00:31:42,520 --> 00:31:47,000
♪

421
00:31:47,160 --> 00:31:49,400
He retreats
to his fortified home...

422
00:31:49,560 --> 00:31:54,160
♪

423
00:31:54,320 --> 00:31:57,640
...and grabs a discarded
paint lid to act as a shield.

424
00:31:57,800 --> 00:32:03,840
♪

425
00:32:04,000 --> 00:32:07,400
He's now ready for anything...

426
00:32:07,560 --> 00:32:10,400
including taking
the paint lid with him.

427
00:32:10,560 --> 00:32:20,040
♪

428
00:32:20,200 --> 00:32:29,680
♪

429
00:32:29,840 --> 00:32:31,640
One last challenge...

430
00:32:31,800 --> 00:32:34,120
♪

431
00:32:34,280 --> 00:32:36,080
...but soon seen off.

432
00:32:36,240 --> 00:32:38,600
♪

433
00:32:38,760 --> 00:32:40,480
That's how he treats
his enemies.

434
00:32:40,640 --> 00:32:50,160
♪

435
00:32:50,320 --> 00:32:52,440
This is how he treats
his friends.

436
00:32:52,600 --> 00:32:59,360
♪

437
00:32:59,520 --> 00:33:06,200
♪

438
00:33:06,360 --> 00:33:12,960
♪

439
00:33:13,120 --> 00:33:15,000
Few are as clever,

440
00:33:15,160 --> 00:33:17,400
but for organisational skills,

441
00:33:17,560 --> 00:33:19,480
he has serious competition.

442
00:33:23,720 --> 00:33:26,240
In the tropical paradise
of Belize,

443
00:33:26,400 --> 00:33:28,960
the hermit crabs have a problem.

444
00:33:34,640 --> 00:33:38,240
They've outgrown their homes...

445
00:33:38,400 --> 00:33:40,880
...or their shells
have become worse for wear.

446
00:33:47,480 --> 00:33:50,040
They need to upsize
their accommodation.

447
00:33:52,680 --> 00:33:55,520
And a new home
has just come on the market.

448
00:34:02,360 --> 00:34:04,320
Those interested
start measuring up.

449
00:34:09,200 --> 00:34:11,080
This one
certainly has potential.

450
00:34:19,920 --> 00:34:22,040
But others, too,
are showing interest...

451
00:34:28,200 --> 00:34:30,280
...even squabbling
over who should move in.

452
00:34:34,040 --> 00:34:35,960
For some, it's too big.

453
00:34:36,120 --> 00:34:39,040
For others, it's too small.

454
00:34:39,200 --> 00:34:40,800
To resolve the issue,

455
00:34:40,960 --> 00:34:43,800
they must stop squabbling
and cooperate.

456
00:34:49,920 --> 00:34:53,520
To find out how,
another spy goes undercover...

457
00:34:53,680 --> 00:34:57,440
[ Whirring ]

458
00:34:57,600 --> 00:35:00,320
...one with a camera
in its shell.

459
00:35:04,680 --> 00:35:07,000
It's arrived
at the perfect moment.

460
00:35:13,240 --> 00:35:17,560
The crabs line up
in order of size.

461
00:35:17,720 --> 00:35:20,160
They don't all need
grand accommodation.

462
00:35:22,560 --> 00:35:26,600
They just need the next size up.

463
00:35:26,760 --> 00:35:29,880
First, they must find their
correct place in the queue.

464
00:35:38,640 --> 00:35:40,560
They wait until everyone
is assembled.

465
00:35:45,040 --> 00:35:47,120
Then the house swap begins.

466
00:35:47,280 --> 00:35:49,000
♪

467
00:35:49,160 --> 00:35:51,120
The largest leaves his old home

468
00:35:51,280 --> 00:35:53,640
and moves into the vacant shell
next door.

469
00:35:53,800 --> 00:35:56,080
♪

470
00:35:56,240 --> 00:36:00,720
Then the next size down takes
over the shell he left behind.

471
00:36:00,880 --> 00:36:03,600
And so it goes on,
in order of size.

472
00:36:03,760 --> 00:36:09,320
♪

473
00:36:09,480 --> 00:36:15,000
♪

474
00:36:15,160 --> 00:36:17,240
Most are content
with their new home...

475
00:36:17,400 --> 00:36:19,520
♪

476
00:36:19,680 --> 00:36:21,800
...although one
seems to have house envy.

477
00:36:25,520 --> 00:36:27,960
He's eyeing up our spy.

478
00:36:28,120 --> 00:36:31,200
♪

479
00:36:31,360 --> 00:36:34,160
He just needs to check the shell
for size.

480
00:36:34,320 --> 00:36:40,160
♪

481
00:36:40,320 --> 00:36:46,320
♪

482
00:36:46,480 --> 00:36:49,520
It meets his requirements,
so he doesn't waste time.

483
00:36:49,680 --> 00:36:55,200
♪

484
00:36:55,360 --> 00:36:58,080
But this home
comes with responsibilities...

485
00:36:58,240 --> 00:37:01,520
♪

486
00:37:01,680 --> 00:37:03,760
...ones that involve
filming, too.

487
00:37:03,920 --> 00:37:10,440
♪

488
00:37:10,600 --> 00:37:17,160
♪

489
00:37:17,320 --> 00:37:20,080
But our new spy seems to be
having second thoughts.

490
00:37:20,240 --> 00:37:23,280
♪

491
00:37:23,440 --> 00:37:27,360
His old shell
was a better fit after all.

492
00:37:27,520 --> 00:37:30,400
He'll keep it
for a little longer.

493
00:37:30,560 --> 00:37:38,360
♪

494
00:37:38,520 --> 00:37:41,680
Our spy is now the only crab
left homeless.

495
00:37:41,840 --> 00:37:43,960
[ Whirring ]

496
00:37:46,600 --> 00:37:51,680
The Caribbean is home
to yet more clever minds.

497
00:37:51,840 --> 00:37:56,160
This tiny island in the Bahamas
has been colonised by wild pigs.

498
00:37:59,240 --> 00:38:02,080
They spend much of their day
just above the tide line.

499
00:38:04,200 --> 00:38:06,240
[ Pig snorting ]
[ Rooster crows ]

500
00:38:08,880 --> 00:38:11,960
To discover how they survive
on this remote island,

501
00:38:12,120 --> 00:38:14,480
Spy Piglet joins the team.

502
00:38:14,640 --> 00:38:20,520
♪

503
00:38:20,680 --> 00:38:23,880
Pigs are highly intelligent
and sociable animals.

504
00:38:24,040 --> 00:38:29,320
♪

505
00:38:29,480 --> 00:38:31,920
So a new pig
soon piques their interest.

506
00:38:32,080 --> 00:38:39,560
♪

507
00:38:39,720 --> 00:38:41,960
Nudging snouts
is a friendly gesture.

508
00:38:42,120 --> 00:38:44,520
♪

509
00:38:44,680 --> 00:38:45,960
A promising start.

510
00:38:46,120 --> 00:38:50,080
♪

511
00:38:50,240 --> 00:38:52,920
Introductions over,
they head to the sea.

512
00:38:53,080 --> 00:38:55,280
[ Pigs snorting ]

513
00:38:57,960 --> 00:39:00,800
The pigs' daily ritual begins.

514
00:39:11,680 --> 00:39:14,440
To find out why they enjoy
swimming so much,

515
00:39:14,600 --> 00:39:18,000
Spy Pig is soon
hot on their curly tails.

516
00:39:20,640 --> 00:39:23,440
What better way to find out
what's going on?

517
00:39:23,600 --> 00:39:29,040
♪

518
00:39:29,200 --> 00:39:31,320
It's clear
that they are expert swimmers.

519
00:39:31,480 --> 00:39:35,880
♪

520
00:39:36,040 --> 00:39:37,840
And even here
they're sociable, too.

521
00:39:38,000 --> 00:39:45,720
♪

522
00:39:45,880 --> 00:39:47,840
Our spy gets another greeting.

523
00:39:48,000 --> 00:39:57,720
♪

524
00:39:57,880 --> 00:40:07,760
♪

525
00:40:07,920 --> 00:40:10,240
Pigs were brought
to the island in the '50s,

526
00:40:10,400 --> 00:40:12,280
surviving on crabs and berries

527
00:40:12,440 --> 00:40:16,040
or whatever else
they could find.

528
00:40:16,200 --> 00:40:19,520
As numbers grew, they looked
to the ocean for a meal.

529
00:40:19,680 --> 00:40:24,200
♪

530
00:40:24,360 --> 00:40:26,960
Tourism brought
new opportunities.

531
00:40:29,600 --> 00:40:32,960
Each day, boats bringing food
would visit them.

532
00:40:33,120 --> 00:40:36,520
[ Engines rumbling ]

533
00:40:36,680 --> 00:40:41,120
Until the sound of outboards
became their dinner bell.

534
00:40:41,280 --> 00:40:44,480
As word got around,
more boats arrived,

535
00:40:44,640 --> 00:40:47,760
until the pigs' daily excursions
became a way of life.

536
00:40:47,920 --> 00:40:51,920
♪

537
00:40:52,080 --> 00:40:54,400
A banquet for all.

538
00:40:54,560 --> 00:41:03,680
♪

539
00:41:03,840 --> 00:41:05,520
They may be social creatures,

540
00:41:05,680 --> 00:41:08,800
but manners are forgotten
when mealtime arrives.

541
00:41:08,960 --> 00:41:14,560
♪

542
00:41:14,720 --> 00:41:17,320
Now it's every pig for itself.

543
00:41:17,480 --> 00:41:20,360
♪

544
00:41:20,520 --> 00:41:24,040
And not just pigs.

545
00:41:24,200 --> 00:41:27,040
Gulls know when
it's feeding time, too.

546
00:41:27,200 --> 00:41:30,440
[ Gulls crying ]

547
00:41:30,600 --> 00:41:37,520
♪

548
00:41:37,680 --> 00:41:42,120
The pigs' intelligence
created this tourist attraction.

549
00:41:42,280 --> 00:41:44,200
But it doesn't take a genius

550
00:41:44,360 --> 00:41:46,040
to know
when all the food is gone.

551
00:41:46,200 --> 00:41:54,200
♪

552
00:41:54,360 --> 00:42:02,400
♪

553
00:42:02,560 --> 00:42:04,600
The search for intelligent life

554
00:42:04,760 --> 00:42:08,000
is taking our spy creatures
to many ocean realms.

555
00:42:10,760 --> 00:42:12,760
But it's the reefs
that provide shelter

556
00:42:12,920 --> 00:42:17,800
for a quarter
of all marine life.

557
00:42:17,960 --> 00:42:21,000
Amongst all this abundance
is Spy Crab.

558
00:42:21,160 --> 00:42:24,520
[ Whirring ]

559
00:42:24,680 --> 00:42:28,120
Beyond the reef is
our spy's subject of interest.

560
00:42:33,040 --> 00:42:35,880
Fish that have found a way
to keep safe,

561
00:42:36,040 --> 00:42:39,000
away from the protection
of the reef.

562
00:42:39,160 --> 00:42:47,680
♪

563
00:42:47,840 --> 00:42:52,720
Our undercover crustacean
will find out how they do it.

564
00:42:52,880 --> 00:42:56,520
The fish in question
are saddleback clownfish.

565
00:42:56,680 --> 00:43:00,120
They use carpet anemones
as their fortress and home.

566
00:43:00,280 --> 00:43:03,280
♪

567
00:43:03,440 --> 00:43:07,080
Its tentacles are laced
with a deadly toxin.

568
00:43:07,240 --> 00:43:11,360
But the clownfish
have acquired immunity.

569
00:43:11,520 --> 00:43:13,480
No predators dare come near.

570
00:43:13,640 --> 00:43:15,920
♪

571
00:43:18,200 --> 00:43:20,880
In return,
the clownfish all muck in

572
00:43:21,040 --> 00:43:23,160
to keep the anemone
spick-and-span.

573
00:43:30,040 --> 00:43:31,800
To raise a family,

574
00:43:31,960 --> 00:43:35,360
they need somewhere safe
to lay their eggs.

575
00:43:35,520 --> 00:43:38,200
A bed of poison
is hardly a nursery.

576
00:43:44,240 --> 00:43:47,840
So a search party sets off to
find something more suitable...

577
00:43:51,040 --> 00:43:53,920
...with Spy Crab
following on behind.

578
00:43:59,120 --> 00:44:01,400
Plastics are the scourge
of the ocean,

579
00:44:01,560 --> 00:44:05,280
but clownfish
are keen on recycling.

580
00:44:05,440 --> 00:44:09,160
A flip-flop would make
an ideal egg nursery,

581
00:44:09,320 --> 00:44:11,320
if only they could
bring it back home.

582
00:44:11,480 --> 00:44:19,440
♪

583
00:44:19,600 --> 00:44:28,000
♪

584
00:44:28,160 --> 00:44:30,080
Even the enterprising clownfish

585
00:44:30,240 --> 00:44:32,240
have no use
for a plastic bottle.

586
00:44:35,160 --> 00:44:37,600
They dispatch it
as quickly as they can.

587
00:44:49,840 --> 00:44:51,920
They need something
more sustainable.

588
00:44:52,080 --> 00:44:55,000
♪

589
00:44:55,160 --> 00:44:58,000
Another job for Spy Octopus.

590
00:44:58,160 --> 00:45:03,640
♪

591
00:45:03,800 --> 00:45:09,400
♪

592
00:45:09,560 --> 00:45:12,360
It has an environmentally
friendly solution.

593
00:45:12,520 --> 00:45:16,960
♪

594
00:45:17,120 --> 00:45:19,480
Just what they were looking for!

595
00:45:19,640 --> 00:45:22,080
♪

596
00:45:27,640 --> 00:45:30,200
In an astonishing display
of teamwork,

597
00:45:30,360 --> 00:45:32,720
they take the coconut shell
to the anemone.

598
00:45:37,560 --> 00:45:40,000
Among fish,
such close cooperation

599
00:45:40,160 --> 00:45:42,240
has rarely been filmed.

600
00:45:49,160 --> 00:45:51,080
But they have more work to do.

601
00:45:55,280 --> 00:45:57,600
A little wash and brush-up
is needed.

602
00:46:00,720 --> 00:46:03,480
Let egg-laying begin.

603
00:46:03,640 --> 00:46:10,240
♪

604
00:46:10,400 --> 00:46:16,800
♪

605
00:46:16,960 --> 00:46:19,120
A nursery, at last.

606
00:46:19,280 --> 00:46:25,360
♪

607
00:46:25,520 --> 00:46:31,600
♪

608
00:46:31,760 --> 00:46:33,720
The male will tend the eggs,

609
00:46:33,880 --> 00:46:35,760
keeping them clean
and well-aerated.

610
00:46:35,920 --> 00:46:40,520
♪

611
00:46:40,680 --> 00:46:45,480
A week later, their young
are ready to emerge,

612
00:46:45,640 --> 00:46:50,240
the reward for the clownfishes'
close cooperation,

613
00:46:50,400 --> 00:46:53,520
one where Spy Octopus
played a part.

614
00:46:53,680 --> 00:46:58,040
♪

615
00:47:00,960 --> 00:47:02,600
As our spies discovered,

616
00:47:02,760 --> 00:47:05,800
sea creatures have
many unique ways of thinking.

617
00:47:09,320 --> 00:47:13,240
But none match the intelligence
of the biggest brains of all.

618
00:47:17,360 --> 00:47:20,120
Spy Sperm Whale was left
on babysitting duties.

619
00:47:23,000 --> 00:47:27,000
It's now keeping watch on
an increasingly restless calf.

620
00:47:30,040 --> 00:47:33,640
Another of its cameras
reveals why he's excited.

621
00:47:33,800 --> 00:47:35,440
[ Whale clicking ]

622
00:47:35,600 --> 00:47:38,120
Below, his mother is returning.

623
00:47:38,280 --> 00:47:40,680
♪

624
00:47:40,840 --> 00:47:43,880
She's been away for many hours,
and her calf is hungry.

625
00:47:44,040 --> 00:47:47,680
[ Clicking continues ]

626
00:47:47,840 --> 00:47:49,800
He's heard
his mother's unique call.

627
00:47:49,960 --> 00:47:54,080
♪

628
00:47:54,240 --> 00:47:56,520
Spy Whale follows
close behind...

629
00:47:56,680 --> 00:48:00,000
♪

630
00:48:00,160 --> 00:48:02,120
...even into the depths.

631
00:48:02,280 --> 00:48:05,600
♪

632
00:48:05,760 --> 00:48:08,600
Here, our spy
captures the moment

633
00:48:08,760 --> 00:48:12,480
the mother positions herself
vertically to feed her calf.

634
00:48:12,640 --> 00:48:18,960
♪

635
00:48:19,120 --> 00:48:22,200
Finally, he finds the spot.

636
00:48:22,360 --> 00:48:25,600
Only now does his mother
release her milk.

637
00:48:25,760 --> 00:48:30,560
♪

638
00:48:30,720 --> 00:48:32,240
Instead of suckling,

639
00:48:32,400 --> 00:48:35,280
the calf drinks the milk
as it flows into the water.

640
00:48:35,440 --> 00:48:37,400
[ Clicking continues ]

641
00:48:37,560 --> 00:48:39,840
It's so rich, even diluted,

642
00:48:40,000 --> 00:48:42,120
he only needs
a little to be satisfied.

643
00:48:42,280 --> 00:48:46,360
♪

644
00:48:46,520 --> 00:48:50,440
Then his mother
does something surprising.

645
00:48:50,600 --> 00:48:54,320
She positions herself
the other way up

646
00:48:54,480 --> 00:48:57,200
and claps the water
with her tail.

647
00:49:11,320 --> 00:49:13,600
[ Rumble ]

648
00:49:13,760 --> 00:49:18,200
Each slap is a signal that
carries for many kilometres...

649
00:49:18,360 --> 00:49:22,160
[ Rumble ]

650
00:49:22,320 --> 00:49:26,000
...one heard by families
from far and wide.

651
00:49:26,160 --> 00:49:28,800
[ Rumble ]

652
00:49:28,960 --> 00:49:31,880
[ Whales clicking ]

653
00:49:32,040 --> 00:49:34,880
♪

654
00:49:35,040 --> 00:49:37,400
[ Rumble ]

655
00:49:37,560 --> 00:49:44,720
♪

656
00:49:44,880 --> 00:49:52,280
♪

657
00:49:52,440 --> 00:49:55,520
For the mother and calf,
it's a special moment.

658
00:49:55,680 --> 00:50:01,480
♪

659
00:50:01,640 --> 00:50:07,240
♪

660
00:50:07,400 --> 00:50:10,520
A family reunion
that has rarely been filmed.

661
00:50:10,680 --> 00:50:13,760
♪

662
00:50:13,920 --> 00:50:16,440
One that includes
our very own spy.

663
00:50:16,600 --> 00:50:20,680
♪

664
00:50:20,840 --> 00:50:23,120
From deep in the heart
of the family,

665
00:50:23,280 --> 00:50:26,240
it now bears witness
to something extraordinary.

666
00:50:26,400 --> 00:50:31,040
♪

667
00:50:31,200 --> 00:50:34,520
Siblings, cousins,
aunts, and grandmothers

668
00:50:34,680 --> 00:50:37,200
join together
in a rare social event.

669
00:50:37,360 --> 00:50:40,240
♪

670
00:50:40,400 --> 00:50:42,960
A meeting of intelligent minds.

671
00:50:43,120 --> 00:50:48,240
♪

672
00:50:48,400 --> 00:50:53,200
But are their thoughts
ones we might recognise?

673
00:50:53,360 --> 00:50:57,800
For they share the brain cells
that help make us human--

674
00:50:57,960 --> 00:50:59,360
specialised neurons

675
00:50:59,520 --> 00:51:02,480
that give us language,
empathy, and culture.

676
00:51:02,640 --> 00:51:04,560
♪

677
00:51:04,720 --> 00:51:06,720
They have more of these
human-like cells

678
00:51:06,880 --> 00:51:10,120
than any animal on Earth.

679
00:51:10,280 --> 00:51:12,320
It seems they are
deep in conversation.

680
00:51:14,640 --> 00:51:16,800
Within this
incredible gathering,

681
00:51:16,960 --> 00:51:18,520
information is exchanged

682
00:51:18,680 --> 00:51:21,080
and bonds of friendship
are strengthened.

683
00:51:21,240 --> 00:51:24,240
♪

684
00:51:24,400 --> 00:51:27,280
This rare event
lasts only a few minutes

685
00:51:27,440 --> 00:51:30,280
before each group
goes its separate ways.

686
00:51:30,440 --> 00:51:35,040
♪

687
00:51:35,200 --> 00:51:39,680
For now, our spy
is still deep in their midst.

688
00:51:39,840 --> 00:51:45,520
♪

689
00:51:45,680 --> 00:51:51,560
♪

690
00:51:51,720 --> 00:51:54,680
Next time, our spies
reveal the deep feelings

691
00:51:54,840 --> 00:51:59,520
found among the creatures
of the ocean...

692
00:51:59,680 --> 00:52:03,000
to discover the origins
of our own emotions.

693
00:52:03,160 --> 00:52:12,960
♪

694
00:52:13,120 --> 00:52:22,960
♪

695
00:52:23,120 --> 00:52:33,040
♪