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♪♪

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-The 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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and incredible intelligence.

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[ Dolphin squeaking ]

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To reveal their secrets,

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a hidden team goes undercover.

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♪♪

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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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♪♪

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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,

40
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a spy is sent among them...

41
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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 almost 10 feet long,

45
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it's the same size
as a newborn calf.

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Large enough to hide
an array of cameras...

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♪♪

48
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...but small enough to arouse

49
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the maternal interest
of a female.

50
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♪♪

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

52
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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...

56
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♪♪

57
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...it's a meeting
with a sentient mind.

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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

63
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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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Waiting in the wings
is arealcalf.

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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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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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♪♪

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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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Meanwhile,
in the coral reefs of Indonesia,

106
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there are more intelligent
life-forms to be found.

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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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♪♪

112
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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 figure it out,
another spy is needed...

116
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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.

119
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What must he be thinking?

120
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Then a clue...

121
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He's working out whether
he's met a friend or a foe.

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It seems our spy is a friend.

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♪♪

124
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Just as well. 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

131
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compared with
the oceans' top predators.

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Blacktip sharks hunt octopus.

133
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♪♪

134
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Fortunately, our spy
doesn't smell like one...

135
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♪♪

136
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...not so the real thing.

137
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He may hide,
but they could still find him.

138
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♪♪

139
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Time for some quick thinking.

140
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♪♪

141
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A hollow bamboo shows promise.

142
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♪♪

143
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But its open entrance
is far from ideal.

144
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Our spy may have the answer.

145
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It's just what
the octopus needs.

146
00:10:29,371 --> 00:10:32,138
But will he dare
take it from him?

147
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♪♪

148
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Like a seasoned thief,

149
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he tries to avoid
raising suspicion.

150
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♪♪

151
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Being aware of what others
could be thinking

152
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is a sign of deep intelligence.

153
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♪♪

154
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A perfect fit!

155
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And just in time!

156
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♪♪

157
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With nothing worth eating,
the sharks move on.

158
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♪♪

159
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The coconut octopus
need hide no more.

160
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♪♪

161
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As a sign of acceptance,
he shows his true feelings.

162
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♪♪

163
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As their relationship grows,

164
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there'll be plenty more
to discover.

165
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♪♪

166
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[ Macaques screeching ]

167
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Of all seagoers,

168
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few are more clever
than these Thailand macaques.

169
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Spy Macaque is discovering

170
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how they survive
on this remote island.

171
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It, too,
has a camera in its eye.

172
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[ Macaques screeching ]

173
00:12:52,171 --> 00:12:55,571
It can not only film
above the surface...

174
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but underwater, too.

175
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As well as being able to swim,

176
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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.

181
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♪♪

182
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When they come up for air,
there's more seafood to find.

183
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♪♪

184
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Our spy has acquired Spy Oyster.

185
00:13:56,405 --> 00:14:00,905
Together they capture
a filming first.

186
00:14:00,905 --> 00:14:04,305
These monkeys have gone fishing,

187
00:14:04,305 --> 00:14:06,805
grabbing whatever
is trapped in the pools.

188
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[ Macaques screeching ]

189
00:14:14,105 --> 00:14:17,071
It takes
quick-witted reactions...

190
00:14:19,838 --> 00:14:21,638
...and a firm grip.

191
00:14:32,638 --> 00:14:34,171
The fish course over,

192
00:14:34,171 --> 00:14:36,638
there's more seafood
on the menu...

193
00:14:42,738 --> 00:14:45,638
...oysters embedded
in the rocks.

194
00:14:47,871 --> 00:14:52,305
They can't be removed
by brute force alone.

195
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It's a task only the best minds
can crack...

196
00:14:57,371 --> 00:14:59,505
...those that can wield a tool.

197
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[ Macaque screeches ]

198
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A treat worth the effort.

199
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♪♪

200
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Finding the right rock
is a knack.

201
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♪♪

202
00:15:29,471 --> 00:15:32,571
It must be
the correct weight and size.

203
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Like this one,
designed for the job in hand.

204
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♪♪

205
00:15:43,205 --> 00:15:46,205
Even so, he must be careful.

206
00:15:46,205 --> 00:15:48,005
♪♪

207
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One slip could be nasty.

208
00:15:50,338 --> 00:15:53,471
♪♪

209
00:15:53,471 --> 00:15:57,438
It's the perfect tool...

210
00:15:57,438 --> 00:15:58,771
...orwas.

211
00:16:03,138 --> 00:16:04,705
Oh, well.

212
00:16:07,971 --> 00:16:10,305
Knowledge comes with experience.

213
00:16:12,138 --> 00:16:14,705
It starts
with a sense of curiosity.

214
00:16:22,671 --> 00:16:25,305
But others are curious, too.

215
00:16:25,305 --> 00:16:30,438
♪♪

216
00:16:30,438 --> 00:16:33,705
Climbing with a spy cam
isn't easy.

217
00:16:33,705 --> 00:16:39,238
♪♪

218
00:16:39,238 --> 00:16:40,738
Whoops!

219
00:16:42,705 --> 00:16:44,271
No matter.

220
00:16:44,271 --> 00:16:47,138
If you're smart,
you know how to have fun.

221
00:16:48,771 --> 00:17:00,738
♪♪

222
00:17:00,738 --> 00:17:04,138
A chance to make friends
and let off steam.

223
00:17:04,138 --> 00:17:05,705
[ Macaques screeching ]

224
00:17:05,705 --> 00:17:13,371
♪♪

225
00:17:13,371 --> 00:17:15,338
As our spies found,

226
00:17:15,338 --> 00:17:18,905
macaques, cast away
on a remote island,

227
00:17:18,905 --> 00:17:20,871
have found clever ways to adapt.

228
00:17:20,871 --> 00:17:23,938
♪♪

229
00:17:23,938 --> 00:17:27,838
Creative thinking can also
be used to find a mate.

230
00:17:31,471 --> 00:17:33,571
In the Sea of Japan,

231
00:17:33,571 --> 00:17:37,038
there's even a sea creature
who creates works of art.

232
00:17:37,038 --> 00:17:40,171
♪♪

233
00:17:40,171 --> 00:17:44,405
Spy Pufferfish
is on a mission to find it.

234
00:17:44,405 --> 00:17:48,438
♪♪

235
00:17:48,438 --> 00:17:52,738
The artist in residence
won't be found among the coral.

236
00:17:54,371 --> 00:17:58,738
It needs a blank canvas
to work with...

237
00:17:58,738 --> 00:18:01,605
something only the sand
provides.

238
00:18:01,605 --> 00:18:05,505
♪♪

239
00:18:05,505 --> 00:18:08,371
And here it is.

240
00:18:08,371 --> 00:18:12,738
An exquisite sand sculpture
found nowhere else on earth.

241
00:18:12,738 --> 00:18:30,805
♪♪

242
00:18:30,805 --> 00:18:34,971
The artist at work is
a male Japanese pufferfish.

243
00:18:42,405 --> 00:18:46,338
He's designed his masterpiece
to lure in a mate.

244
00:18:52,938 --> 00:18:57,571
An artistic creation
to delight a female's eye.

245
00:19:05,138 --> 00:19:08,305
He uses a fin
to plow a furrow...

246
00:19:10,571 --> 00:19:13,871
...while other fins
sweep the sand into ridges.

247
00:19:17,471 --> 00:19:21,638
The gullies channel the finest
particles towards the center.

248
00:19:26,071 --> 00:19:29,538
The result is a fully functional
work of art.

249
00:19:31,105 --> 00:19:33,171
It's now Spy Puffer's turn.

250
00:19:33,171 --> 00:19:34,671
[ Soft whirring ]

251
00:19:34,671 --> 00:19:47,305
♪♪

252
00:19:47,305 --> 00:19:50,338
Artworks are best viewed
at a distance.

253
00:19:50,338 --> 00:20:00,338
♪♪

254
00:20:00,338 --> 00:20:01,905
Oh, dear...

255
00:20:07,005 --> 00:20:09,705
Nothing compares
to the true artist.

256
00:20:09,705 --> 00:20:13,138
♪♪

257
00:20:17,471 --> 00:20:19,738
The female will decide.

258
00:20:22,671 --> 00:20:26,071
Spy Puffer's creation
is hardly worth a second look.

259
00:20:30,771 --> 00:20:33,238
She's after a masterpiece.

260
00:20:39,438 --> 00:20:42,138
But for this discerning
art critic,

261
00:20:42,138 --> 00:20:44,105
there's still room
for improvement.

262
00:20:46,871 --> 00:20:50,405
Especially when some debris
spoils the design.

263
00:20:52,471 --> 00:20:55,571
A blemish easily dealt with
by the male.

264
00:21:02,305 --> 00:21:05,438
But it still needs
some finishing touches...

265
00:21:07,705 --> 00:21:10,838
...such as shells
to decorate the ridges.

266
00:21:15,605 --> 00:21:18,271
They're more than
an artistic flourish.

267
00:21:18,271 --> 00:21:20,371
They stabilize the ridges,

268
00:21:20,371 --> 00:21:23,505
slowing the water
that might stir the center...

269
00:21:25,671 --> 00:21:29,205
...for this is where the female
will lay her eggs.

270
00:21:31,238 --> 00:21:33,605
But the male
has run out of shells,

271
00:21:33,605 --> 00:21:35,938
and the female
is losing interest.

272
00:21:39,405 --> 00:21:42,671
Spy Puffer becomes
the artist's assistant.

273
00:21:42,671 --> 00:21:51,405
♪♪

274
00:21:51,405 --> 00:21:53,505
The finishing touch he needs.

275
00:21:53,505 --> 00:22:06,771
♪♪

276
00:22:06,771 --> 00:22:09,738
All this striving
for artistic perfection

277
00:22:09,738 --> 00:22:11,538
is a test of his fitness.

278
00:22:11,538 --> 00:22:16,671
♪♪

279
00:22:16,671 --> 00:22:19,805
Satisfied with
the aesthetic details,

280
00:22:19,805 --> 00:22:21,671
the female enters the nest.

281
00:22:21,671 --> 00:22:26,771
♪♪

282
00:22:26,771 --> 00:22:29,705
They join together,
cheek-to-cheek.

283
00:22:29,705 --> 00:22:35,538
♪♪

284
00:22:35,538 --> 00:22:37,705
Then, quick as a flash,

285
00:22:37,705 --> 00:22:40,038
the eggs are laid
and fertilized.

286
00:22:40,038 --> 00:22:44,305
♪♪

287
00:22:44,305 --> 00:22:46,871
With a little help
from Spy Puffer,

288
00:22:46,871 --> 00:22:50,038
the next generation of artists
is on its way.

289
00:22:56,338 --> 00:22:59,005
While pufferfish
think creatively,

290
00:22:59,005 --> 00:23:01,671
fish shoals all think together.

291
00:23:03,071 --> 00:23:07,005
They show swarm intelligence,
moving as one.

292
00:23:07,005 --> 00:23:09,838
They mirror the moves
of their nearest neighbors.

293
00:23:13,871 --> 00:23:17,671
Their group thinking is about to
be tested by smarter minds.

294
00:23:17,671 --> 00:23:21,138
♪♪

295
00:23:21,138 --> 00:23:23,938
Marlin...

296
00:23:23,938 --> 00:23:27,471
one of the ocean's
fastest predators.

297
00:23:27,471 --> 00:23:29,138
♪♪

298
00:23:29,138 --> 00:23:34,505
They use teamwork to drive
mackerel up from the depths,

299
00:23:34,505 --> 00:23:37,838
forcing them to the surface
in even tighter balls.

300
00:23:37,838 --> 00:23:39,571
♪♪

301
00:23:39,571 --> 00:23:42,338
And they're not alone.

302
00:23:42,338 --> 00:23:44,571
Sea lions soon join in.

303
00:23:44,571 --> 00:23:47,705
♪♪

304
00:23:47,705 --> 00:23:52,338
Among them
is a new spy creature.

305
00:23:52,338 --> 00:23:53,938
Spy Sea Lion.

306
00:23:55,905 --> 00:23:57,638
Like the real thing,

307
00:23:57,638 --> 00:24:01,371
its flexible body lets it
maneuver among the shoals.

308
00:24:01,371 --> 00:24:10,271
♪♪

309
00:24:10,271 --> 00:24:13,405
Its eye cams
gain a sea lion's view

310
00:24:13,405 --> 00:24:15,538
as the marlin spear their prey.

311
00:24:15,538 --> 00:24:20,671
♪♪

312
00:24:20,671 --> 00:24:22,571
Like master swordsmen,

313
00:24:22,571 --> 00:24:26,271
they use their 3-foot-long bills
as deadly weapons.

314
00:24:26,271 --> 00:24:32,705
♪♪

315
00:24:32,705 --> 00:24:37,305
As the hunt continues,
our spy films an insider's view.

316
00:24:41,305 --> 00:24:43,605
It won't be working alone.

317
00:24:45,038 --> 00:24:48,605
As frigate birds gather,
another spy joins...

318
00:24:50,738 --> 00:24:55,005
...one that captures the
marlins' skills from the air.

319
00:25:00,238 --> 00:25:05,105
They corral the shoal,
concentrating the ball,

320
00:25:05,105 --> 00:25:07,538
letting them pick off
the fish on the outside.

321
00:25:09,905 --> 00:25:12,505
But they don't have it all
their own way.

322
00:25:12,505 --> 00:25:14,405
[ Whirring ]

323
00:25:15,871 --> 00:25:18,071
The marlin
will soon be competing

324
00:25:18,071 --> 00:25:20,871
with those with
far greater intelligence.

325
00:25:25,205 --> 00:25:29,005
Spy Sea Lion
now has plenty of company.

326
00:25:30,938 --> 00:25:33,705
They are here in their hundreds.

327
00:25:33,705 --> 00:25:38,438
♪♪

328
00:25:38,438 --> 00:25:40,171
Working together,

329
00:25:40,171 --> 00:25:42,471
they steal the bait ball
from the marlin.

330
00:25:42,471 --> 00:25:46,005
♪♪

331
00:25:51,971 --> 00:25:57,505
Our spy reveals what happens
once the sea lions take over.

332
00:25:57,505 --> 00:26:01,005
It joins them as they unite
to split the ball...

333
00:26:03,638 --> 00:26:07,671
...capturing a sea lion's view
from inside the shoal.

334
00:26:09,738 --> 00:26:12,905
It shows how the fish
move as one.

335
00:26:17,705 --> 00:26:19,705
Its swarm intelligence

336
00:26:19,705 --> 00:26:22,605
pitched against
that of the sea lions.

337
00:26:25,438 --> 00:26:29,405
This is where true intelligence
shows its worth.

338
00:26:31,405 --> 00:26:35,438
They work together
to force the shoal apart.

339
00:26:35,438 --> 00:26:38,271
They can now pick off
the weak and injured.

340
00:26:38,271 --> 00:26:42,471
♪♪

341
00:26:42,471 --> 00:26:45,571
Sea lions can eat
30 pounds of fish a day.

342
00:26:45,571 --> 00:26:48,905
♪♪

343
00:26:48,905 --> 00:26:53,571
But such a colossal bait ball
is too much, even for them.

344
00:26:53,571 --> 00:26:55,905
♪♪

345
00:26:55,905 --> 00:26:59,105
They start to play with
their food rather than eat it.

346
00:26:59,105 --> 00:27:03,671
♪♪

347
00:27:03,671 --> 00:27:06,371
Then...something unexpected.

348
00:27:12,938 --> 00:27:16,605
They gift the leftovers
to the hungry marlin.

349
00:27:16,605 --> 00:27:23,105
♪♪

350
00:27:23,105 --> 00:27:25,838
There's even a fish
for Spy Sea Lion.

351
00:27:25,838 --> 00:27:34,271
♪♪

352
00:27:34,271 --> 00:27:37,838
Not much use to our spy...

353
00:27:37,838 --> 00:27:39,371
it is to the marlin.

354
00:27:39,371 --> 00:27:42,571
♪♪

355
00:27:42,571 --> 00:27:47,371
The sea lions may have
outsmarted swarm intelligence...

356
00:27:47,371 --> 00:27:50,771
but even they can be beaten
by a bigger power.

357
00:27:50,771 --> 00:27:57,805
♪♪

358
00:27:57,805 --> 00:28:02,205
A Bryde's whale will make
short work of what they've left.

359
00:28:02,205 --> 00:28:06,505
♪♪

360
00:28:11,871 --> 00:28:14,571
Back on the reef,
there are more insights

361
00:28:14,571 --> 00:28:17,271
to be gained
from the coconut octopus.

362
00:28:26,605 --> 00:28:30,705
Spy Octopus is still nurturing
its newfound relationship.

363
00:28:40,105 --> 00:28:43,205
Their bond
has only grown stronger.

364
00:28:47,038 --> 00:28:50,771
To feed, the octopus
must leave his hideaway.

365
00:28:59,338 --> 00:29:03,271
As a precaution, he takes
the coconut shell with him.

366
00:29:11,705 --> 00:29:14,471
What was once
the door to his refuge

367
00:29:14,471 --> 00:29:16,571
is now a mobile home.

368
00:29:16,571 --> 00:29:32,771
♪♪

369
00:29:32,771 --> 00:29:35,505
But there are more surprises
in store.

370
00:29:37,471 --> 00:29:40,971
The octopus is still looking
to improve his security.

371
00:29:43,071 --> 00:29:45,805
Some armor plating
would be useful.

372
00:29:49,238 --> 00:29:51,505
A shell would be perfect!

373
00:30:04,738 --> 00:30:07,971
His only problem
is carrying it all.

374
00:30:07,971 --> 00:30:21,938
♪♪

375
00:30:21,938 --> 00:30:25,471
This is taking defense
seriously.

376
00:30:25,471 --> 00:30:32,071
♪♪

377
00:30:32,071 --> 00:30:33,505
All bases covered,

378
00:30:33,505 --> 00:30:36,505
he's perfectly placed
to stage an ambush.

379
00:30:44,605 --> 00:30:46,971
And what better than a crab?

380
00:30:49,638 --> 00:30:51,571
The chase is on!

381
00:30:51,571 --> 00:30:55,138
♪♪

382
00:30:55,138 --> 00:30:57,938
But the crab
has a trick of its own.

383
00:30:59,738 --> 00:31:02,238
it heads to the surface.

384
00:31:02,238 --> 00:31:04,105
So does the octopus.

385
00:31:04,105 --> 00:31:08,671
♪♪

386
00:31:11,805 --> 00:31:13,471
He makes a grab!

387
00:31:13,471 --> 00:31:20,338
♪♪

388
00:31:20,338 --> 00:31:24,571
The crab is firmly in his grasp,
but he must eat quickly.

389
00:31:27,405 --> 00:31:29,505
He's being watched.

390
00:31:31,338 --> 00:31:34,105
A rival coconut octopus.

391
00:31:36,071 --> 00:31:39,538
His color change
shows he means business.

392
00:31:39,538 --> 00:31:46,305
♪♪

393
00:31:46,305 --> 00:31:49,338
To up the ante,
he makes himself bigger.

394
00:31:49,338 --> 00:31:53,638
♪♪

395
00:31:53,638 --> 00:31:56,871
But the octopus
stands his ground...

396
00:31:56,871 --> 00:32:00,205
before firing a salvo of shells.

397
00:32:04,805 --> 00:32:07,471
He retreats
to his fortified home...

398
00:32:07,471 --> 00:32:12,005
♪♪

399
00:32:12,005 --> 00:32:15,738
...and grabs a discarded
paint lid to act as a shield.

400
00:32:15,738 --> 00:32:21,838
♪♪

401
00:32:21,838 --> 00:32:24,105
He's now ready for anything...

402
00:32:25,305 --> 00:32:28,538
...including taking
the paint lid with him.

403
00:32:28,538 --> 00:32:47,738
♪♪

404
00:32:47,738 --> 00:32:50,038
One last challenge...

405
00:32:52,005 --> 00:32:54,271
...but soon seen off.

406
00:32:56,671 --> 00:32:58,738
That's how he treats
his enemies.

407
00:32:58,738 --> 00:33:08,038
♪♪

408
00:33:08,038 --> 00:33:10,838
This is how he treats
his friends.

409
00:33:10,838 --> 00:33:30,771
♪♪

410
00:33:30,771 --> 00:33:33,238
Few are as clever,

411
00:33:33,238 --> 00:33:35,438
but for organizational skills,

412
00:33:35,438 --> 00:33:38,071
he has some serious competition.

413
00:33:41,071 --> 00:33:44,338
In the tropical paradise
of Belize,

414
00:33:44,338 --> 00:33:46,638
the hermit crabs have a problem.

415
00:33:52,205 --> 00:33:54,305
They've outgrown their homes...

416
00:33:56,438 --> 00:33:59,138
...or their shells
have become worse for wear.

417
00:34:05,505 --> 00:34:08,571
They need to upsize
their accommodation.

418
00:34:10,771 --> 00:34:14,238
And a new home
has just come on the market.

419
00:34:19,638 --> 00:34:23,038
Those interested
start measuring up.

420
00:34:26,738 --> 00:34:29,471
This one
certainly has potential.

421
00:34:37,738 --> 00:34:40,805
But others, too,
are showing interest...

422
00:34:46,071 --> 00:34:49,038
...even squabbling
over who should move in.

423
00:34:51,771 --> 00:34:55,938
For some, it's too big.
For others, it's too small.

424
00:34:57,738 --> 00:34:59,205
To resolve the issue,

425
00:34:59,205 --> 00:35:02,171
they must stop squabbling
and cooperate.

426
00:35:07,638 --> 00:35:11,738
To find out how,
another spy goes undercover...

427
00:35:11,738 --> 00:35:13,338
[ Soft whirring ]

428
00:35:15,505 --> 00:35:18,138
...one with a camera
in its shell.

429
00:35:22,371 --> 00:35:25,105
It's arrived
at the perfect moment.

430
00:35:31,105 --> 00:35:34,171
The crabs line up
in order of size.

431
00:35:36,271 --> 00:35:38,538
They don't all need
grand accommodation.

432
00:35:40,905 --> 00:35:42,971
They just need the next size up.

433
00:35:44,538 --> 00:35:48,338
First, they must find their
correct place in the queue.

434
00:35:55,738 --> 00:35:59,205
They wait until everyone
is assembled.

435
00:36:02,371 --> 00:36:05,071
Then the house swap begins.

436
00:36:05,071 --> 00:36:07,238
♪♪

437
00:36:07,238 --> 00:36:09,605
The largest leaves his old home

438
00:36:09,605 --> 00:36:12,005
and moves into the vacant shell
next door.

439
00:36:12,005 --> 00:36:14,238
♪♪

440
00:36:14,238 --> 00:36:17,538
Then the next size down takes
over the shell he left behind.

441
00:36:17,538 --> 00:36:19,238
♪♪

442
00:36:19,238 --> 00:36:21,705
And so it goes on
in order of size.

443
00:36:21,705 --> 00:36:33,071
♪♪

444
00:36:33,071 --> 00:36:35,538
Most are content
with their new home...

445
00:36:35,538 --> 00:36:37,338
♪♪

446
00:36:37,338 --> 00:36:40,138
...although one
seems to have house envy.

447
00:36:40,138 --> 00:36:43,471
♪♪

448
00:36:43,471 --> 00:36:45,938
He's eyeing up our spy.

449
00:36:45,938 --> 00:36:49,005
♪♪

450
00:36:49,005 --> 00:36:51,838
He just needs to check the shell
for size.

451
00:36:51,838 --> 00:37:03,838
♪♪

452
00:37:03,838 --> 00:37:07,671
It meets his requirements,
so he doesn't waste time.

453
00:37:07,671 --> 00:37:13,138
♪♪

454
00:37:13,138 --> 00:37:16,171
But this home
comes with responsibilities...

455
00:37:16,171 --> 00:37:19,605
♪♪

456
00:37:19,605 --> 00:37:21,971
...ones that involve
filming, too.

457
00:37:21,971 --> 00:37:34,505
♪♪

458
00:37:34,505 --> 00:37:38,405
But our new spy seems to be
having second thoughts.

459
00:37:38,405 --> 00:37:41,471
♪♪

460
00:37:41,471 --> 00:37:44,238
His old shell
was a better fit after all.

461
00:37:44,238 --> 00:37:46,105
♪♪

462
00:37:46,105 --> 00:37:48,205
He'll keep it
for a little longer.

463
00:37:48,205 --> 00:37:56,138
♪♪

464
00:37:56,138 --> 00:37:59,571
Our spy is now the only crab
left homeless.

465
00:37:59,571 --> 00:38:01,171
[ Soft whirring ]

466
00:38:03,271 --> 00:38:04,638
[ Birds calling ]

467
00:38:04,638 --> 00:38:08,438
The Caribbean is home
to yet more clever minds.

468
00:38:08,438 --> 00:38:13,871
This tiny island in the Bahamas
has been colonized by wild pigs.

469
00:38:17,105 --> 00:38:20,138
They spend much of their day
just above the tide line.

470
00:38:22,305 --> 00:38:23,638
[ Pig snorting ]

471
00:38:23,638 --> 00:38:25,071
[ Rooster crows ]

472
00:38:26,605 --> 00:38:30,038
To discover how they survive
on this remote island,

473
00:38:30,038 --> 00:38:32,505
Spy Piglet joins the team.

474
00:38:32,505 --> 00:38:38,305
♪♪

475
00:38:38,305 --> 00:38:42,005
Pigs are highly intelligent
and sociable animals.

476
00:38:42,005 --> 00:38:47,171
♪♪

477
00:38:47,171 --> 00:38:50,605
So a new pig
soon piques their interest.

478
00:38:50,605 --> 00:38:57,571
♪♪

479
00:38:57,571 --> 00:39:00,238
Nudging snouts
is a friendly gesture.

480
00:39:00,238 --> 00:39:02,605
♪♪

481
00:39:02,605 --> 00:39:04,071
A promising start.

482
00:39:04,071 --> 00:39:07,905
♪♪

483
00:39:07,905 --> 00:39:11,005
Introductions over,
they head to the sea.

484
00:39:11,005 --> 00:39:12,705
[ Pigs snorting ]

485
00:39:15,838 --> 00:39:18,571
The pigs' daily ritual begins.

486
00:39:29,471 --> 00:39:32,738
To find out why they enjoy
swimming so much,

487
00:39:32,738 --> 00:39:35,838
Spy Pig is soon
hot on their curly tails.

488
00:39:39,071 --> 00:39:41,171
What better way to find out
what's going on?

489
00:39:41,171 --> 00:39:46,871
♪♪

490
00:39:46,871 --> 00:39:49,805
It's clear
they are expert swimmers.

491
00:39:49,805 --> 00:39:53,638
♪♪

492
00:39:53,638 --> 00:39:56,405
And even here
they're sociable, too.

493
00:39:56,405 --> 00:40:03,705
♪♪

494
00:40:03,705 --> 00:40:05,838
Our spy gets another greeting.

495
00:40:05,838 --> 00:40:25,005
♪♪

496
00:40:25,005 --> 00:40:27,738
Pigs were brought
to the island in the '50s,

497
00:40:27,738 --> 00:40:29,771
surviving on crabs and berries

498
00:40:29,771 --> 00:40:32,105
or whatever else
they could find.

499
00:40:33,838 --> 00:40:35,705
As their numbers grew,

500
00:40:35,705 --> 00:40:37,671
they looked to the ocean
for a meal.

501
00:40:37,671 --> 00:40:41,838
♪♪

502
00:40:41,838 --> 00:40:44,971
Tourism brought
new opportunities.

503
00:40:47,605 --> 00:40:50,571
Each day, boats bringing food
would visit them.

504
00:40:50,571 --> 00:40:54,238
[ Engines rumbling ]

505
00:40:54,238 --> 00:40:57,738
Until the sound of outboards
became their dinner bell.

506
00:40:59,538 --> 00:41:02,338
As word got around,
more boats arrived

507
00:41:02,338 --> 00:41:05,938
until the pigs' daily excursions
became a way of life.

508
00:41:10,305 --> 00:41:12,271
A banquet for all.

509
00:41:12,271 --> 00:41:21,305
♪♪

510
00:41:21,305 --> 00:41:24,038
They may be social creatures,

511
00:41:24,038 --> 00:41:27,505
but manners are forgotten
when mealtime arrives.

512
00:41:27,505 --> 00:41:32,505
♪♪

513
00:41:32,505 --> 00:41:35,271
Now it's every pig for itself.

514
00:41:35,271 --> 00:41:38,538
♪♪

515
00:41:38,538 --> 00:41:40,005
And not just pigs.

516
00:41:40,005 --> 00:41:42,538
♪♪

517
00:41:42,538 --> 00:41:45,171
Gulls know when
it's feeding time, too.

518
00:41:45,171 --> 00:41:47,205
[ Gulls crying ]

519
00:41:47,205 --> 00:41:56,905
♪♪

520
00:41:56,905 --> 00:42:00,838
The pigs' intelligence
created this tourist attraction.

521
00:42:02,671 --> 00:42:04,171
But it doesn't take a genius

522
00:42:04,171 --> 00:42:06,538
to know
when all the food is gone.

523
00:42:06,538 --> 00:42:19,638
♪♪

524
00:42:19,638 --> 00:42:22,105
The search for intelligent life

525
00:42:22,105 --> 00:42:26,238
is taking our spy creatures
to many ocean realms.

526
00:42:28,471 --> 00:42:30,838
But it's the reefs
that provide shelter

527
00:42:30,838 --> 00:42:35,438
for a quarter
of all marine life.

528
00:42:35,438 --> 00:42:39,171
Amongst all this abundance
is Spy Crab.

529
00:42:39,171 --> 00:42:40,571
[ Soft whirring ]

530
00:42:44,905 --> 00:42:48,838
Beyond the reef is
our spy's subject of interest.

531
00:42:51,005 --> 00:42:53,871
Fish that have found a way
to keep safe,

532
00:42:53,871 --> 00:42:56,005
away from the protection
of the reef.

533
00:42:57,338 --> 00:43:05,738
♪♪

534
00:43:05,738 --> 00:43:11,005
Our undercover crustacean
will find out how they do it.

535
00:43:11,005 --> 00:43:14,971
The fish in question
are saddleback clownfish.

536
00:43:14,971 --> 00:43:20,871
They use carpet anemones
as their fortress and home.

537
00:43:20,871 --> 00:43:25,105
Its tentacles are laced
with a deadly toxin.

538
00:43:25,105 --> 00:43:29,405
But the clownfish
have acquired immunity.

539
00:43:29,405 --> 00:43:31,371
No predators dare come near.

540
00:43:35,871 --> 00:43:38,571
In return,
the clownfish all pitch in

541
00:43:38,571 --> 00:43:41,105
to keep the anemone
spick and span.

542
00:43:47,638 --> 00:43:49,705
But to raise a family,

543
00:43:49,705 --> 00:43:53,671
they need somewhere safe
to lay their eggs.

544
00:43:53,671 --> 00:43:56,571
A bed of poison
is hardly a nursery.

545
00:44:00,971 --> 00:44:05,838
So a search party sets off to
find something more suitable...

546
00:44:08,938 --> 00:44:11,605
...with Spy Crab
following on behind.

547
00:44:16,471 --> 00:44:19,905
Plastics are the scourge
of the ocean,

548
00:44:19,905 --> 00:44:22,738
but clownfish
are keen on recycling.

549
00:44:22,738 --> 00:44:24,038
♪♪

550
00:44:24,038 --> 00:44:27,871
A flip-flop would make
an ideal egg nursery,

551
00:44:27,871 --> 00:44:29,538
if only they could
bring it back home.

552
00:44:29,538 --> 00:44:45,805
♪♪

553
00:44:45,805 --> 00:44:48,238
Even the enterprising clownfish

554
00:44:48,238 --> 00:44:50,438
have no use
for a plastic bottle.

555
00:44:52,905 --> 00:44:55,705
They dispatch it
as quickly as they can.

556
00:45:07,138 --> 00:45:09,838
They need something
more sustainable.

557
00:45:09,838 --> 00:45:13,071
♪♪

558
00:45:13,071 --> 00:45:15,938
Another job for Spy Octopus.

559
00:45:15,938 --> 00:45:27,138
♪♪

560
00:45:27,138 --> 00:45:30,471
It has an environmentally
friendly solution.

561
00:45:30,471 --> 00:45:35,105
♪♪

562
00:45:35,105 --> 00:45:36,971
Just what they were looking for!

563
00:45:36,971 --> 00:45:40,605
♪♪

564
00:45:45,238 --> 00:45:48,371
In an astonishing display
of teamwork,

565
00:45:48,371 --> 00:45:51,471
they take the coconut shell
to the anemone.

566
00:45:55,171 --> 00:45:58,371
Among fish,
such close cooperation

567
00:45:58,371 --> 00:46:00,205
has rarely been filmed.

568
00:46:06,805 --> 00:46:09,338
But they have more work to do.

569
00:46:12,771 --> 00:46:15,671
A little wash and brush-up
is needed.

570
00:46:18,271 --> 00:46:21,505
Then...let egg-laying begin.

571
00:46:21,505 --> 00:46:34,738
♪♪

572
00:46:34,738 --> 00:46:37,171
A nursery, at last.

573
00:46:37,171 --> 00:46:49,138
♪♪

574
00:46:49,138 --> 00:46:51,371
The male will tend the eggs,

575
00:46:51,371 --> 00:46:54,105
keeping them clean
and well-aerated.

576
00:46:54,105 --> 00:46:58,438
♪♪

577
00:46:58,438 --> 00:47:02,238
A week later, their young
are ready to emerge.

578
00:47:04,071 --> 00:47:08,371
The reward for the clownfishes'
close cooperation...

579
00:47:08,371 --> 00:47:11,271
one where Spy Octopus
played a part.

580
00:47:11,271 --> 00:47:16,238
♪♪

581
00:47:18,438 --> 00:47:20,871
As our spies discovered,

582
00:47:20,871 --> 00:47:23,871
sea creatures have
many unique ways of thinking.

583
00:47:26,738 --> 00:47:31,938
But none match the intelligence
of the biggest brains of all.

584
00:47:34,405 --> 00:47:38,205
Spy Sperm Whale was left
on babysitting duties.

585
00:47:41,038 --> 00:47:44,705
It's now keeping watch on
an increasingly restless calf.

586
00:47:47,738 --> 00:47:51,505
Another of its cameras
reveals why he's excited.

587
00:47:51,505 --> 00:47:53,438
[ Whale clicking ]

588
00:47:53,438 --> 00:47:56,138
Below, his mother is returning.

589
00:47:56,138 --> 00:47:58,205
♪♪

590
00:47:58,205 --> 00:48:02,971
She's been away for many hours,
and her calf is hungry.

591
00:48:02,971 --> 00:48:05,805
[ Whale clicking ]

592
00:48:05,805 --> 00:48:08,505
He's heard
his mother's unique call.

593
00:48:08,505 --> 00:48:11,738
♪♪

594
00:48:11,738 --> 00:48:14,405
Spy Whale follows
close behind...

595
00:48:14,405 --> 00:48:18,238
♪♪

596
00:48:18,238 --> 00:48:20,338
...even into the depths.

597
00:48:20,338 --> 00:48:23,505
♪♪

598
00:48:23,505 --> 00:48:26,105
Here, our spy
captures the moment

599
00:48:26,105 --> 00:48:30,038
the mother positions herself
vertically to feed her calf.

600
00:48:30,038 --> 00:48:36,571
♪♪

601
00:48:36,571 --> 00:48:39,705
Finally, he finds the spot.

602
00:48:39,705 --> 00:48:41,105
♪♪

603
00:48:41,105 --> 00:48:43,871
Only now does his mother
release her milk.

604
00:48:43,871 --> 00:48:47,905
♪♪

605
00:48:47,905 --> 00:48:49,505
Instead of suckling,

606
00:48:49,505 --> 00:48:53,338
the calf drinks the milk
as it flows into the water.

607
00:48:53,338 --> 00:48:55,471
[ Whale clicking ]

608
00:48:55,471 --> 00:48:57,105
It's so rich,

609
00:48:57,105 --> 00:49:00,971
even diluted, he only needs
a little to be satisfied.

610
00:49:00,971 --> 00:49:04,671
♪♪

611
00:49:04,671 --> 00:49:08,471
Then his mother
does something surprising.

612
00:49:08,471 --> 00:49:12,405
She positions herself
upside down...

613
00:49:12,405 --> 00:49:15,271
and claps the water
with her tail.

614
00:49:29,071 --> 00:49:31,005
[ Rumble ]

615
00:49:31,005 --> 00:49:35,338
Each slap is a signal
that carries for miles...

616
00:49:36,538 --> 00:49:37,871
[ Rumble ]

617
00:49:39,971 --> 00:49:43,005
...one heard by families
far and wide.

618
00:49:44,838 --> 00:49:46,571
[ Rumble ]

619
00:49:46,571 --> 00:49:48,771
[ Whales clicking ]

620
00:49:48,771 --> 00:49:53,305
♪♪

621
00:49:53,305 --> 00:49:54,538
[ Rumble ]

622
00:49:54,538 --> 00:50:01,538
♪♪

623
00:50:01,538 --> 00:50:03,138
[ Rumble ]

624
00:50:03,138 --> 00:50:10,205
♪♪

625
00:50:10,205 --> 00:50:13,805
For the mother and calf,
it's a special moment.

626
00:50:13,805 --> 00:50:25,371
♪♪

627
00:50:25,371 --> 00:50:28,738
A family reunion
that has rarely been filmed.

628
00:50:28,738 --> 00:50:31,605
♪♪

629
00:50:31,605 --> 00:50:34,471
One that includes
our very own spy.

630
00:50:34,471 --> 00:50:38,471
♪♪

631
00:50:38,471 --> 00:50:41,171
From deep in the heart
of the family,

632
00:50:41,171 --> 00:50:44,605
it now bears witness
to something extraordinary.

633
00:50:44,605 --> 00:50:48,538
♪♪

634
00:50:48,538 --> 00:50:52,638
Siblings, cousins,
aunts, and grandmothers

635
00:50:52,638 --> 00:50:57,371
join together
in a remarkable social event.

636
00:50:57,371 --> 00:51:00,338
A meeting of intelligent minds.

637
00:51:00,338 --> 00:51:05,905
♪♪

638
00:51:05,905 --> 00:51:09,905
But are their thoughts
ones we might recognize?

639
00:51:11,238 --> 00:51:15,971
For they share the brain cells
that help make us human --

640
00:51:15,971 --> 00:51:17,905
specialized neurons

641
00:51:17,905 --> 00:51:22,538
that give us language,
empathy, and culture.

642
00:51:22,538 --> 00:51:25,071
They have more of these
human-like cells

643
00:51:25,071 --> 00:51:28,138
than any animal on Earth.

644
00:51:28,138 --> 00:51:31,105
It seems they are
deep in conversation.

645
00:51:32,538 --> 00:51:35,038
Within this
incredible gathering,

646
00:51:35,038 --> 00:51:37,005
information is exchanged

647
00:51:37,005 --> 00:51:39,771
and bonds of friendship
are strengthened.

648
00:51:39,771 --> 00:51:42,171
♪♪

649
00:51:42,171 --> 00:51:45,738
This rare event
lasts only a few minutes

650
00:51:45,738 --> 00:51:48,805
before each group
goes its separate ways.

651
00:51:48,805 --> 00:51:52,871
♪♪

652
00:51:52,871 --> 00:51:57,905
But for now, our spy
is still deep in their midst.

653
00:51:57,905 --> 00:52:09,305
♪♪

654
00:52:09,305 --> 00:52:13,238
Next time, our spies
reveal the deep feelings

655
00:52:13,238 --> 00:52:16,871
found among the creatures
of the ocean...

656
00:52:16,871 --> 00:52:21,471
to discover the origins
of our own emotions.

657
00:52:21,471 --> 00:52:23,805
♪♪

658
00:52:25,771 --> 00:53:06,871
♪♪

659
00:53:06,871 --> 00:53:08,771
To learn more
about what you've seen

660
00:53:08,771 --> 00:53:10,438
on this "Nature" program,

661
00:53:10,438 --> 00:53:12,405
visit pbs.org.

662
00:53:12,405 --> 00:53:15,905
♪♪