1
00:00:02,000 --> 00:00:05,660
The animal world is full
of spectacle and wonder.

2
00:00:07,300 --> 00:00:10,420
But what's it like to be right
in the heart of the action?

3
00:00:12,460 --> 00:00:16,180
To find out, our team of
spy creatures goes undercover.

4
00:00:18,580 --> 00:00:21,220
They not only look like the animals
they film...

5
00:00:22,740 --> 00:00:25,180
..they behave like them, too.

6
00:00:29,940 --> 00:00:32,820
Armed with the latest
camera technology...

7
00:00:35,380 --> 00:00:37,780
..they are heading across the globe.

8
00:00:43,300 --> 00:00:45,140
From the heat of the Tropics...

9
00:00:47,980 --> 00:00:50,900
..to the lands
that lie in the north.

10
00:00:54,540 --> 00:00:57,260
From the islands
of the Southern Seas...

11
00:01:00,540 --> 00:01:03,820
..to the snow and ice
of the frozen poles.

12
00:01:05,900 --> 00:01:11,140
Our spies reveal the astonishing
variety of life that thrives there,

13
00:01:11,140 --> 00:01:14,660
from inside their world.

14
00:01:21,940 --> 00:01:25,980
On this assignment, our spy
creatures join the animal families

15
00:01:25,980 --> 00:01:28,620
that dwell in the hot and humid
Tropics.

16
00:01:33,740 --> 00:01:36,340
In the tropical zone,
life is abundant,

17
00:01:36,340 --> 00:01:38,340
and the dry and rainy seasons

18
00:01:38,340 --> 00:01:41,180
influence animals
in remarkable ways.

19
00:01:45,140 --> 00:01:48,180
When the dry season comes
to the mountains of Uganda,

20
00:01:48,180 --> 00:01:51,340
it brings cool nights and warm days.

21
00:01:53,620 --> 00:01:57,460
As the morning mist clears,
a glimpse of the wonders to come.

22
00:02:02,900 --> 00:02:06,020
For now, there's just one,
lone baby.

23
00:02:12,620 --> 00:02:17,140
His camera eye the only clue
he's not as real as he seems.

24
00:02:28,180 --> 00:02:30,220
GRUNTING

25
00:02:33,100 --> 00:02:37,260
His aim - to join this family
of mountain gorillas.

26
00:02:38,740 --> 00:02:41,100
But, first, he must gain
their trust.

27
00:02:43,980 --> 00:02:46,900
One wrong move
and it could all be over.

28
00:02:51,100 --> 00:02:53,100
They are a close-knit family.

29
00:02:54,940 --> 00:02:57,580
They don't take kindly to strangers.

30
00:03:04,260 --> 00:03:06,580
He offers a hand of friendship.

31
00:03:08,540 --> 00:03:10,860
Will they accept his introduction?

32
00:03:18,940 --> 00:03:23,980
A promising start, but, somehow,
he must convince everyone.

33
00:03:23,980 --> 00:03:25,620
GRUNTING

34
00:03:27,660 --> 00:03:31,140
She peers into his eyes
to make a connection.

35
00:03:31,140 --> 00:03:33,980
Gorillas learn a lot from each other
this way.

36
00:03:35,740 --> 00:03:38,580
But he remains inscrutable, as ever.

37
00:03:54,860 --> 00:03:57,100
Now it's the baby's turn.

38
00:04:00,540 --> 00:04:02,580
Gorillas are very tactile.

39
00:04:10,940 --> 00:04:14,620
A touch is an invitation
to get to know each other.

40
00:04:20,300 --> 00:04:22,660
But is it all too good to be true?

41
00:04:24,180 --> 00:04:25,820
HE SNARLS

42
00:04:30,780 --> 00:04:32,660
The great silverback.

43
00:04:32,660 --> 00:04:35,980
He won't be so easily impressed.

44
00:04:39,340 --> 00:04:40,900
HE PANTS

45
00:04:43,300 --> 00:04:45,940
Here, he's the boss.

46
00:04:45,940 --> 00:04:49,500
Spy Gorilla won't be welcomed
without his say-so.

47
00:05:02,340 --> 00:05:04,700
HE BARKS
A warning.

48
00:05:04,700 --> 00:05:06,340
Everyone must stay back.

49
00:05:08,580 --> 00:05:11,100
Can our spy win him over, too?

50
00:05:13,900 --> 00:05:16,700
They await
the silverback's decision.

51
00:05:16,700 --> 00:05:18,940
HE BARKS

52
00:05:20,820 --> 00:05:24,260
Until then, there's a line
no-one can cross.

53
00:05:24,260 --> 00:05:28,300
His arm, a barrier between them
and the newcomer.

54
00:05:35,580 --> 00:05:39,140
To show respect,
our spy averts his gaze.

55
00:05:43,300 --> 00:05:45,740
Decision made.

56
00:05:45,740 --> 00:05:48,940
Spy Gorilla can stay.

57
00:05:52,500 --> 00:05:54,900
Everyone can relax once more.

58
00:05:58,140 --> 00:05:59,980
CONTENTED GRUNTING

59
00:06:04,380 --> 00:06:07,740
In adults, chest-beating
is a show of power.

60
00:06:07,740 --> 00:06:11,260
For youngsters,
it's an invitation to play.

61
00:06:28,820 --> 00:06:31,500
But games easily get out of hand.

62
00:06:35,060 --> 00:06:36,900
Oops!

63
00:06:43,780 --> 00:06:46,100
His look says it all.

64
00:06:54,420 --> 00:06:56,580
Best pretend it never happened.

65
00:07:00,500 --> 00:07:03,540
But it's not the end for our spy.

66
00:07:05,020 --> 00:07:07,220
He lives to film another day.

67
00:07:07,220 --> 00:07:09,060
HE GRUNTS SOFTLY

68
00:07:13,380 --> 00:07:16,140
The dry season
has also come to Brazil.

69
00:07:18,620 --> 00:07:22,100
The Pantanal is the world's
largest tropical wetland.

70
00:07:22,100 --> 00:07:25,420
But, at this time of year,
it's drying out fast.

71
00:07:29,820 --> 00:07:32,380
Life gathers
in spectacular abundance

72
00:07:32,380 --> 00:07:35,260
around the few pools of open water
that remain.

73
00:07:36,700 --> 00:07:40,900
As well as egrets, caiman congregate
in their thousands,

74
00:07:40,900 --> 00:07:43,500
some of the 10 million found
across the Pantanal.

75
00:07:45,140 --> 00:07:48,060
Such abundance attracts
other predators.

76
00:07:48,060 --> 00:07:49,700
CHIRRUPING

77
00:07:54,180 --> 00:07:57,820
Meet the world's first
Spy Jaguar cub.

78
00:08:03,460 --> 00:08:06,500
Caiman are the jaguar's
favourite prey.

79
00:08:06,500 --> 00:08:08,140
BIRDSONG

80
00:08:09,820 --> 00:08:12,620
But they have little to fear
from a solitary cub.

81
00:08:15,700 --> 00:08:20,140
Having basked in the sun,
they're primed and eager to hunt.

82
00:08:29,900 --> 00:08:32,540
Spy Caiman is ready and waiting.

83
00:08:42,900 --> 00:08:45,020
He's now just one of the locals.

84
00:08:49,300 --> 00:08:52,220
Wherever they go, he goes, too.

85
00:08:59,380 --> 00:09:02,220
It's soon clear
why everyone is here -

86
00:09:02,220 --> 00:09:06,500
thousands of fish are trapped
in the vanishing pools.

87
00:09:10,980 --> 00:09:14,020
But there is little oxygen
in these waters.

88
00:09:14,020 --> 00:09:16,820
And, as the day warms,
it holds even less.

89
00:09:22,700 --> 00:09:25,180
The caiman is ready.

90
00:09:25,180 --> 00:09:28,300
Catfish are coming
to the surface for air.

91
00:09:31,260 --> 00:09:34,260
All good things
come to those who wait.

92
00:09:38,740 --> 00:09:40,460
It's a feeding frenzy.

93
00:09:57,460 --> 00:10:00,700
The morning feast
lasts just a brief moment.

94
00:10:00,700 --> 00:10:03,340
Soon, everyone can eat no more.

95
00:10:05,900 --> 00:10:08,820
Only now do the capybara
venture out.

96
00:10:08,820 --> 00:10:10,420
THEY GRUNT AGGRESSIVELY

97
00:10:12,300 --> 00:10:15,180
They're the world's largest
living rodent,

98
00:10:15,180 --> 00:10:16,900
and one of the most intelligent.

99
00:10:22,660 --> 00:10:25,540
They welcome the dry land
that's now appearing.

100
00:10:34,860 --> 00:10:37,060
It's perfect
for a spot of sunbathing.

101
00:10:43,860 --> 00:10:46,020
But they must keep their wits
about them.

102
00:10:49,780 --> 00:10:52,060
JAGUAR SNARLS SOFTLY

103
00:10:57,980 --> 00:10:59,540
CAPYBARA PURRS

104
00:11:01,220 --> 00:11:02,980
JAGUAR PANTS

105
00:11:12,620 --> 00:11:15,060
Something else
now piques his interest.

106
00:11:23,580 --> 00:11:26,580
JAGUAR PURRS

107
00:11:28,260 --> 00:11:30,460
Jaguars kill the cubs of others.

108
00:11:33,940 --> 00:11:35,980
JAGUAR SNIFFS

109
00:11:46,420 --> 00:11:49,380
But curiosity overcomes aggression.

110
00:11:52,420 --> 00:11:54,700
This isn't the only jaguar here.

111
00:11:57,900 --> 00:11:59,740
A rival!

112
00:12:02,380 --> 00:12:05,660
Jaguars are fiercely territorial.

113
00:12:09,460 --> 00:12:11,700
THEY GRUNT FEROCIOUSLY

114
00:12:36,900 --> 00:12:39,340
The result is a draw.

115
00:12:39,340 --> 00:12:41,780
Neither willing to risk their life.

116
00:12:50,540 --> 00:12:52,940
Is this the reason for the brawling?

117
00:12:54,900 --> 00:12:57,220
A partner worth fighting for?

118
00:12:59,220 --> 00:13:01,260
SHE SNARLS

119
00:13:03,940 --> 00:13:05,980
SHE SNARLS

120
00:13:05,980 --> 00:13:09,100
In courtship, it seems,
the female takes control.

121
00:13:10,060 --> 00:13:12,380
SHE SNARLS

122
00:13:15,140 --> 00:13:18,180
Having put him in his place,
she turns on the charm.

123
00:13:21,020 --> 00:13:23,940
A rarely-filmed
moment of tranquillity

124
00:13:23,940 --> 00:13:27,260
in one of the busiest
wildlife spots on Earth.

125
00:13:33,180 --> 00:13:37,220
Costa Rica is next to host
one of the Tropics' great events.

126
00:13:41,660 --> 00:13:44,980
Black vultures gather
in anticipation.

127
00:13:44,980 --> 00:13:47,580
This year, they have company.

128
00:13:49,220 --> 00:13:51,380
A vulture that can film.

129
00:14:02,140 --> 00:14:04,980
The gathering begins on the third
quarter of the moon,

130
00:14:04,980 --> 00:14:06,860
when the tides are at their minimum.

131
00:14:08,300 --> 00:14:10,340
Olive ridley turtles.

132
00:14:13,180 --> 00:14:15,860
Many travelled over 1,000 miles
to get here.

133
00:14:19,100 --> 00:14:22,940
They're returning to the beach
where once they were born.

134
00:14:22,940 --> 00:14:24,940
WAVES CRASH

135
00:14:24,940 --> 00:14:28,020
When the tide is out
and the surface calm,

136
00:14:28,020 --> 00:14:30,020
they come ashore.

137
00:14:38,180 --> 00:14:39,780
TURTLE SNORTS

138
00:14:39,780 --> 00:14:42,940
Where one leads, others follow.

139
00:14:46,140 --> 00:14:48,020
For those breeding
for the first time,

140
00:14:48,020 --> 00:14:52,380
15 years have passed since
they hatched on this very beach.

141
00:14:53,860 --> 00:14:57,460
Now, they compete for a place
to lay eggs of their own.

142
00:15:00,060 --> 00:15:03,420
This is the great turtle arribada.

143
00:15:14,140 --> 00:15:17,020
20,000 may arrive in a single day.

144
00:15:25,260 --> 00:15:27,700
Only so much can be seen
from the air.

145
00:15:34,780 --> 00:15:36,220
WAVES CRASH

146
00:15:36,220 --> 00:15:39,220
As they keep coming,
so do our spy creatures.

147
00:15:44,660 --> 00:15:48,020
Spy Turtle is here,
as our eyes on the ground.

148
00:15:58,300 --> 00:16:01,500
Turtles lay above
the high water mark.

149
00:16:01,500 --> 00:16:04,300
So, first, our spy must
climb the beach.

150
00:16:16,380 --> 00:16:19,940
In water, turtles
are effectively weightless.

151
00:16:19,940 --> 00:16:22,220
Now, flippers meant for swimming

152
00:16:22,220 --> 00:16:25,180
must haul huge bodies
across the sand.

153
00:16:26,940 --> 00:16:29,420
LABOURED BREATHING

154
00:16:31,300 --> 00:16:34,340
Spy Turtle is soon
in prime position...

155
00:16:35,900 --> 00:16:38,300
..ready to film their
nesting techniques.

156
00:16:44,100 --> 00:16:47,140
Her flippers become scoops.

157
00:16:47,140 --> 00:16:49,180
Tools to dig a nest.

158
00:17:05,020 --> 00:17:07,060
Now, the moment she came for.

159
00:17:08,860 --> 00:17:11,620
Each egg is carefully placed.

160
00:17:14,380 --> 00:17:16,980
Up to 100 in every clutch.

161
00:17:23,420 --> 00:17:25,140
She must bury them quickly.

162
00:17:27,820 --> 00:17:29,860
They're what the vultures
were waiting for.

163
00:17:33,140 --> 00:17:35,940
Those already buried
are beyond reach,

164
00:17:35,940 --> 00:17:39,820
but turtles still laying
must fend off thieves.

165
00:17:48,500 --> 00:17:50,180
VULTURE HISSES

166
00:17:50,180 --> 00:17:53,540
As things hot up,
Spy Turtle needs backup.

167
00:17:57,860 --> 00:18:00,180
A clutch of hidden cameras.

168
00:18:12,940 --> 00:18:16,540
So far, the vultures
have had little reward.

169
00:18:16,540 --> 00:18:18,820
That's about to change.

170
00:18:26,100 --> 00:18:29,460
There are so many turtles,
every spot has been taken.

171
00:18:34,420 --> 00:18:38,260
Eggs of previous visitors are
batted away like ping-pong balls.

172
00:18:41,540 --> 00:18:44,340
Straight into the mouths
of the vultures.

173
00:18:58,900 --> 00:19:01,660
They finally get their reward.

174
00:19:11,180 --> 00:19:13,580
VULTURES HISS REPEATEDLY

175
00:19:21,940 --> 00:19:23,820
But all is not lost.

176
00:19:23,820 --> 00:19:26,300
Beneath the sand,
enough eggs will survive

177
00:19:26,300 --> 00:19:28,540
to produce the next generation.

178
00:19:35,180 --> 00:19:37,820
As the turtles'
epic undertaking ends,

179
00:19:37,820 --> 00:19:40,020
they return to
the sanctuary of the sea.

180
00:19:44,380 --> 00:19:48,860
Around 50 days will pass before
their eggs are ready to hatch.

181
00:19:53,060 --> 00:19:55,540
As the turtles' eggs
are left to incubate,

182
00:19:55,540 --> 00:19:58,260
Zambia is in the grip of
its dry season.

183
00:20:00,140 --> 00:20:03,980
The vast Luangwa River
is reduced to barely a trickle.

184
00:20:07,180 --> 00:20:08,820
Desperate animals gather,

185
00:20:08,820 --> 00:20:12,020
seeking the only available water
for hundreds of miles.

186
00:20:15,020 --> 00:20:17,460
Everyone is feeling the pressure.

187
00:20:22,260 --> 00:20:24,180
HIPPO SNORTS

188
00:20:26,980 --> 00:20:29,140
Especially the hippos.

189
00:20:29,140 --> 00:20:31,380
THEY SNORT AGGRESSIVELY

190
00:20:32,660 --> 00:20:35,940
The shrinking river has forced
families closer together.

191
00:20:37,500 --> 00:20:40,340
Rivals now live cheek by jowl.

192
00:20:41,780 --> 00:20:43,380
Tensions mount.

193
00:20:45,660 --> 00:20:48,860
What must it be like
inside this pressure cooker?

194
00:20:52,540 --> 00:20:55,020
Spy Croc is about to find out.

195
00:21:01,460 --> 00:21:03,340
It could be a dangerous mission.

196
00:21:22,100 --> 00:21:25,220
Hippos and crocs co-exist
in an uneasy truce.

197
00:21:28,100 --> 00:21:31,300
Enough to allow Spy Croc
into their midst.

198
00:21:35,620 --> 00:21:38,460
The reason lies just beneath
the surface.

199
00:21:42,500 --> 00:21:44,740
Fish are everywhere...

200
00:21:51,060 --> 00:21:53,580
..attracted by the waste
the hippos produce.

201
00:21:57,780 --> 00:22:00,620
With plenty of fish
for crocodiles to eat,

202
00:22:00,620 --> 00:22:03,140
hippos have little to worry about.

203
00:22:06,540 --> 00:22:09,700
But, in the middle of the pod,
where the youngsters are found,

204
00:22:09,700 --> 00:22:12,500
croc attacks
are still a real threat.

205
00:22:16,460 --> 00:22:18,860
This is a job for Spy Hippo.

206
00:22:22,660 --> 00:22:26,380
To succeed, he must give off
all the right signals.

207
00:22:26,380 --> 00:22:28,420
HE SNORTS

208
00:22:33,020 --> 00:22:35,100
This is a high-security area.

209
00:22:36,660 --> 00:22:40,700
Here, the dominant bull
watches over the mothers and young.

210
00:22:44,660 --> 00:22:47,380
But he seems surprisingly amiable.

211
00:22:55,260 --> 00:22:57,860
Even letting Spy Hippo
approach a baby.

212
00:23:07,460 --> 00:23:09,820
Here, the youngsters
can safely play.

213
00:23:11,140 --> 00:23:13,540
For now, it's just a game.

214
00:23:17,980 --> 00:23:21,420
One day, they'll be fighting
for the best spots in the river.

215
00:23:28,900 --> 00:23:30,140
An intruder.

216
00:23:31,780 --> 00:23:33,940
A male looking for females.

217
00:23:38,100 --> 00:23:40,380
The resident bull must defend
his position.

218
00:23:40,380 --> 00:23:42,220
HE SNORTS

219
00:23:44,580 --> 00:23:46,620
It's wise to get out of the way.

220
00:23:56,020 --> 00:23:58,620
But Spy Hippo
is right in the battle zone.

221
00:24:06,300 --> 00:24:08,620
It doesn't get riskier than this.

222
00:24:24,020 --> 00:24:27,020
The rival is
unceremoniously dispatched.

223
00:24:27,020 --> 00:24:29,020
HE GRUNTS

224
00:24:39,340 --> 00:24:42,380
As tempers calm,
the hippos settle down,

225
00:24:42,380 --> 00:24:44,460
doing what they do best.

226
00:24:50,060 --> 00:24:53,620
Sleeping, for up to 16 hours a day.

227
00:25:02,100 --> 00:25:05,060
While for some,
drought is a time of hardship,

228
00:25:05,060 --> 00:25:08,460
carmine bee-eaters
relish this time of year.

229
00:25:11,780 --> 00:25:15,660
The exposed river banks
provide safe nest sites.

230
00:25:16,820 --> 00:25:19,860
Spy Egret is at the heart
of their colony...

231
00:25:22,500 --> 00:25:25,220
..poised to capture
a bird's-eye view.

232
00:25:25,220 --> 00:25:27,140
INCESSANT BIRDSONG

233
00:25:36,940 --> 00:25:39,940
It's the avian equivalent
of an apartment block.

234
00:26:11,820 --> 00:26:15,900
Back in Uganda, Spy Gorilla
is now one of the family.

235
00:26:23,860 --> 00:26:26,660
It's an opportunity to explore
their intelligence.

236
00:26:28,300 --> 00:26:32,980
Fruit Cam is a replica of a local
fruit, and is totally non-toxic.

237
00:26:45,620 --> 00:26:49,420
Being smart means they're fascinated
by anything new.

238
00:26:51,300 --> 00:26:54,500
Their social nature
makes them happy to share.

239
00:27:04,940 --> 00:27:07,500
It's now a game of pass the parcel.

240
00:27:15,620 --> 00:27:19,580
But what about this - Spy Grub?

241
00:27:19,580 --> 00:27:22,380
One of our more outlandish spy cams.

242
00:27:22,380 --> 00:27:24,580
SHE GRUNTS

243
00:27:28,820 --> 00:27:30,820
SHE SNIFFS

244
00:27:31,940 --> 00:27:34,660
Whatever her baby finds
must be checked out.

245
00:27:39,780 --> 00:27:41,420
Impressed?

246
00:27:44,060 --> 00:27:45,620
Not so much.

247
00:27:47,740 --> 00:27:51,980
But the other spies are recording
something truly ground-breaking.

248
00:27:51,980 --> 00:27:54,020
CONTENTED GRUNTING

249
00:27:56,140 --> 00:27:59,620
They've caught our gorillas
singing as they eat.

250
00:27:59,620 --> 00:28:01,500
CONTENTED VOCALISATION

251
00:28:03,900 --> 00:28:06,020
It's a chorus of appreciation.

252
00:28:06,020 --> 00:28:09,060
The first time this phenomenon
has ever been recorded

253
00:28:09,060 --> 00:28:11,300
among wild mountain gorillas.

254
00:28:11,300 --> 00:28:13,740
VOCALISING CONTINUES

255
00:28:34,860 --> 00:28:37,340
They not only sing for their supper,

256
00:28:37,340 --> 00:28:41,980
consuming 20 kilos a day
is bound to have consequences.

257
00:28:41,980 --> 00:28:46,300
IT BREAKS WIND REPEATEDLY

258
00:28:49,380 --> 00:28:52,940
They live in a semi-permanent state
of flatulence.

259
00:28:52,940 --> 00:28:56,900
IT BREAKS WIND

260
00:28:59,980 --> 00:29:03,100
IT BREAKS WIND

261
00:29:05,820 --> 00:29:08,140
IT BREAKS WIND

262
00:29:16,220 --> 00:29:17,820
IT BREAKS WIND

263
00:29:21,140 --> 00:29:24,260
Back in Costa Rica,
two months have passed

264
00:29:24,260 --> 00:29:27,020
since the great turtle arribada.

265
00:29:29,020 --> 00:29:32,140
Only one, lonesome turtle
is still here...

266
00:29:33,180 --> 00:29:36,820
..ready to record the next
great moment in their lives.

267
00:29:47,580 --> 00:29:50,180
The eggs have finally hatched.

268
00:29:52,460 --> 00:29:56,900
To find the sea, the hatchlings
turn to face the brightest horizon.

269
00:30:02,180 --> 00:30:04,060
But there's trouble ahead.

270
00:30:10,780 --> 00:30:13,900
Frigatebirds have travelled far
for this event.

271
00:30:19,900 --> 00:30:23,540
For the hatchlings,
it's a race against the odds.

272
00:30:34,100 --> 00:30:36,380
The frigates are spoilt for choice.

273
00:30:41,020 --> 00:30:43,020
Spy Turtle is still at
the nest site.

274
00:30:46,100 --> 00:30:48,500
There's always one
who's left behind.

275
00:30:56,820 --> 00:30:58,460
She cannot stay here.

276
00:31:03,820 --> 00:31:05,980
She, too, must run the gauntlet.

277
00:31:12,180 --> 00:31:14,020
But the terrain is treacherous.

278
00:31:19,740 --> 00:31:22,220
Ahead, the aerial attack
is relentless.

279
00:31:32,900 --> 00:31:35,420
But the urge to reach the sea
is overwhelming.

280
00:31:42,140 --> 00:31:44,300
Now it's all down to luck.

281
00:32:07,620 --> 00:32:09,100
Another is lost.

282
00:32:28,060 --> 00:32:30,460
This is her new home.

283
00:32:33,780 --> 00:32:37,060
It will be 15 years
before she returns to this beach

284
00:32:37,060 --> 00:32:39,660
to lay eggs of her own.

285
00:32:39,660 --> 00:32:41,860
WAVES CRASH

286
00:32:46,020 --> 00:32:47,740
BIRDSONG

287
00:32:52,260 --> 00:32:56,100
In the tropics of South America,
the rains have arrived,

288
00:32:56,100 --> 00:33:00,460
and the Amazon Rainforest is
undergoing a magical transformation.

289
00:33:05,260 --> 00:33:09,500
The daily deluge causes the mighty
Amazon River to burst its banks

290
00:33:09,500 --> 00:33:11,660
and flood the surrounding forest.

291
00:33:13,980 --> 00:33:16,980
Water levels can rise
as much as 15 metres.

292
00:33:20,540 --> 00:33:23,860
For the animal inhabitants,
life changes completely.

293
00:33:27,580 --> 00:33:31,420
To investigate, spy creatures
are everywhere.

294
00:33:32,940 --> 00:33:36,700
Staked out in the trees,
and in the water below.

295
00:33:37,980 --> 00:33:39,740
They don't have to wait long.

296
00:33:42,380 --> 00:33:44,220
MONKEY CHITTERS

297
00:33:44,220 --> 00:33:47,140
Capuchin monkeys are territorial.

298
00:33:51,180 --> 00:33:53,340
They make their feelings clear.

299
00:33:53,340 --> 00:33:55,420
MONKEY CHITTERS

300
00:33:55,420 --> 00:33:58,980
But they've never seen a monkey
quite like this.

301
00:34:02,900 --> 00:34:04,460
MONKEY CHITTERS

302
00:34:06,540 --> 00:34:09,420
Irritation turns to intrigue.

303
00:34:14,780 --> 00:34:17,020
And curiosity conquers caution.

304
00:34:17,020 --> 00:34:18,940
MONKEY CHITTERS

305
00:34:31,060 --> 00:34:33,420
With the forest floor under water,

306
00:34:33,420 --> 00:34:35,820
the monkeys must forage
in the tree tops.

307
00:34:38,500 --> 00:34:42,300
Conveniently, it's the season
when many trees bear fruit.

308
00:34:43,740 --> 00:34:45,540
A treat not just for monkeys.

309
00:34:48,660 --> 00:34:53,260
Scarlet macaws come from far
and wide to enjoy the harvest.

310
00:34:54,660 --> 00:34:56,820
Spy Macaw is here to greet them.

311
00:34:56,820 --> 00:34:58,900
SQUAWKING

312
00:35:06,500 --> 00:35:10,740
Gorging on fruit helps them
reach prime breeding condition.

313
00:35:10,740 --> 00:35:12,940
SQUAWKING

314
00:35:21,020 --> 00:35:23,940
Everywhere, love is in the air.

315
00:35:28,380 --> 00:35:31,860
Even Spy Sloth seems to
have gained an admirer.

316
00:35:34,340 --> 00:35:36,780
As sloths rarely cross paths,

317
00:35:36,780 --> 00:35:38,980
she'll take the opportunity
when she can.

318
00:35:46,700 --> 00:35:49,380
Her first move is to rub noses.

319
00:35:52,820 --> 00:35:54,820
Followed by a mating call.

320
00:35:54,820 --> 00:35:57,260
HIGH-PITCHED SCREECHING

321
00:36:07,900 --> 00:36:10,860
But, this time,
her calls go unanswered.

322
00:36:13,140 --> 00:36:16,860
Never mind, there are plenty more
eligible sloths in the forest.

323
00:36:21,460 --> 00:36:25,300
Down below, a rather bizarre
spy creature takes over.

324
00:36:27,180 --> 00:36:30,580
A replica of the animal
it has come to film.

325
00:36:34,660 --> 00:36:36,820
Amazon river dolphins.

326
00:36:39,580 --> 00:36:42,060
It's an otherworldly meeting.

327
00:36:45,900 --> 00:36:50,060
As eyes are of little use
in murky water, they've become tiny.

328
00:36:52,260 --> 00:36:54,340
Other senses compensate.

329
00:36:57,020 --> 00:37:01,580
Sensitive hairs on her beak
react to the slightest vibration.

330
00:37:03,300 --> 00:37:07,340
While sensors in her mouth
detect the electric fields of prey.

331
00:37:10,980 --> 00:37:14,660
The greeting is an alien
sensory experience.

332
00:37:23,420 --> 00:37:27,060
Courtesies over,
it's down to business.

333
00:37:29,540 --> 00:37:32,660
The best hunting is found among
the submerged trees.

334
00:37:45,620 --> 00:37:48,980
Fish are drawn to the food
and shelter they provide.

335
00:37:50,460 --> 00:37:53,580
To catch them,
the dolphins hunt together.

336
00:37:53,580 --> 00:37:56,940
One flushes the fish from hiding,

337
00:37:56,940 --> 00:38:00,460
the other...reaps the reward.

338
00:38:08,380 --> 00:38:10,980
It's a technique that rarely fails.

339
00:38:22,180 --> 00:38:24,740
A fish supper served up
among the trees

340
00:38:24,740 --> 00:38:27,380
that are usually high and dry.

341
00:38:32,860 --> 00:38:34,500
BIRDSONG

342
00:38:36,300 --> 00:38:40,180
In Australia's tropical north,
as the cool season arrives,

343
00:38:40,180 --> 00:38:43,220
the continent's greatest gathering
of mammals occurs.

344
00:38:43,220 --> 00:38:45,260
CHIRPING

345
00:38:51,660 --> 00:38:53,460
100,000 of them in all.

346
00:38:59,660 --> 00:39:02,020
They are little red flying foxes.

347
00:39:06,140 --> 00:39:09,660
Mothers gather together in
huge nurseries among the eucalyptus.

348
00:39:16,140 --> 00:39:19,340
Today, a new bat has joined them.

349
00:39:21,700 --> 00:39:25,260
A way of taking a closer look
at life inside their world.

350
00:39:27,140 --> 00:39:30,140
But, first, Spy Bat
must earn their trust.

351
00:39:40,060 --> 00:39:42,860
She has been anointed
with smells from the colony.

352
00:39:46,340 --> 00:39:48,620
She can also mimic
their friendship calls.

353
00:39:48,620 --> 00:39:49,660
CHIRPING

354
00:39:51,900 --> 00:39:55,140
Having passed inspection,
she fits right in.

355
00:39:57,980 --> 00:40:02,020
Capturing the most intimate views
of a maternity roost ever seen.

356
00:40:09,860 --> 00:40:12,540
Mothers and their babies
are never parted.

357
00:40:13,860 --> 00:40:17,300
Even when they fly,
there's a baby onboard.

358
00:40:17,300 --> 00:40:19,020
CHIRPING

359
00:40:21,060 --> 00:40:22,980
They're caring and attentive,

360
00:40:22,980 --> 00:40:25,660
washing their pups
to keep them clean and fresh.

361
00:40:28,500 --> 00:40:30,220
She won't miss an inch.

362
00:40:30,220 --> 00:40:32,060
CHIRPING

363
00:40:40,060 --> 00:40:43,580
At several weeks old,
the youngsters never stay still.

364
00:40:43,580 --> 00:40:45,900
Making bath time a challenge.

365
00:40:57,140 --> 00:40:59,620
The mothers raise their young
in wintertime,

366
00:40:59,620 --> 00:41:01,540
in what should be
the coolest months.

367
00:41:03,020 --> 00:41:06,460
But, today, they must flap
their wings just to keep cool.

368
00:41:06,460 --> 00:41:08,260
INCESSANT CHIRPING

369
00:41:14,740 --> 00:41:16,980
Even Spy Bat joins in.

370
00:41:19,740 --> 00:41:23,300
As the climate changes, winters
are becoming hotter than ever.

371
00:41:24,980 --> 00:41:27,340
Heatstroke is now a common threat.

372
00:41:31,140 --> 00:41:34,260
Only the cool of evening
brings some relief.

373
00:41:41,420 --> 00:41:44,620
As they leave,
Spy Bat quietly follows.

374
00:41:46,380 --> 00:41:49,620
Its wings are designed
to dampen the sound of its motors.

375
00:41:51,500 --> 00:41:54,740
It also has a lowlight camera,
able to film at dusk.

376
00:42:01,260 --> 00:42:03,140
After the extreme heat of the day,

377
00:42:03,140 --> 00:42:06,140
the river is a place to cool down
and rehydrate.

378
00:42:08,580 --> 00:42:10,180
They have a novel technique.

379
00:42:13,140 --> 00:42:14,740
They belly-flop.

380
00:42:16,540 --> 00:42:19,100
Plunge-diving traps water
in their fur.

381
00:42:19,100 --> 00:42:21,260
Convenient for
in-flight refreshment.

382
00:42:25,260 --> 00:42:28,300
But all this splashing
attracts attention.

383
00:42:28,300 --> 00:42:31,860
Freshwater crocodiles are moving in.

384
00:42:34,380 --> 00:42:36,820
All they have to do is wait.

385
00:42:46,140 --> 00:42:48,620
For the crocs,
it's a matter of timing.

386
00:42:52,060 --> 00:42:54,500
For the bats, it's a matter of luck.

387
00:43:19,700 --> 00:43:22,740
There's always one
whose luck runs out.

388
00:43:25,220 --> 00:43:29,260
Refreshed, the survivors
head off to find nectar.

389
00:43:29,260 --> 00:43:32,140
As they feed,
they pollinate millions of trees.

390
00:43:33,740 --> 00:43:37,300
In this way, Australia's
great eucalyptus forest

391
00:43:37,300 --> 00:43:41,020
depends on flying foxes
for its survival.

392
00:43:48,580 --> 00:43:51,420
As the year moves on, the dry season

393
00:43:51,420 --> 00:43:54,220
comes to Borneo's
mysterious forests.

394
00:43:57,140 --> 00:43:59,300
The creatures of the forest
now congregate

395
00:43:59,300 --> 00:44:01,060
around the life-giving rivers.

396
00:44:01,060 --> 00:44:03,860
Most are found nowhere else
on Earth.

397
00:44:16,620 --> 00:44:20,220
Proboscis monkeys,
the most aquatic monkey of all.

398
00:44:21,900 --> 00:44:23,500
GRUNTING

399
00:44:28,980 --> 00:44:31,900
They live alongside
another denizen of the forest.

400
00:44:33,820 --> 00:44:35,980
But this one is a spy.

401
00:44:43,180 --> 00:44:45,980
He's here to meet
whoever visits the river.

402
00:44:55,980 --> 00:44:58,500
The group is led by a dominant male,

403
00:44:58,500 --> 00:45:03,460
easily distinguished by his massive
nose, used to amplify his calls.

404
00:45:03,460 --> 00:45:05,620
NASAL GRUNTING

405
00:45:07,780 --> 00:45:10,900
So the button-nosed youngsters
have some way to go.

406
00:45:29,100 --> 00:45:32,740
The rest of his troop is made up
of mothers and their offspring...

407
00:45:32,740 --> 00:45:34,580
SCREECHING

408
00:45:34,580 --> 00:45:37,740
..including young males
spoiling for a fight.

409
00:45:37,740 --> 00:45:39,620
SCREECHING

410
00:45:42,980 --> 00:45:45,340
But there's only one
who's really in charge.

411
00:45:45,340 --> 00:45:47,460
NASAL GRUNTING

412
00:45:58,940 --> 00:46:01,780
Real orangutans are also drawn
to the plants

413
00:46:01,780 --> 00:46:03,740
that thrive near the river.

414
00:46:09,140 --> 00:46:12,340
Any new orangutan
always creates a stir.

415
00:46:14,380 --> 00:46:17,180
Best check out this one from afar.

416
00:46:24,940 --> 00:46:26,900
Now for a closer look.

417
00:46:48,060 --> 00:46:50,060
Perhaps wisest left alone.

418
00:46:53,020 --> 00:46:55,820
There's yet one more
unique animal to meet.

419
00:46:55,820 --> 00:46:57,540
SNORTING

420
00:47:02,500 --> 00:47:04,140
BIRDSONG

421
00:47:07,420 --> 00:47:09,620
The elusive pygmy elephant.

422
00:47:13,660 --> 00:47:16,340
The smallest elephant in the world.

423
00:47:19,060 --> 00:47:20,780
CURIOUS SNORTING

424
00:47:24,340 --> 00:47:26,300
CURIOUS SNORTING

425
00:47:26,300 --> 00:47:30,380
These surprisingly gentle creatures
are rarely seen.

426
00:47:30,380 --> 00:47:34,420
But, in the dry season,
they visit the river more often.

427
00:47:37,580 --> 00:47:40,100
Here, another spy awaits.

428
00:47:40,100 --> 00:47:42,860
GENTLE GROWLING

429
00:47:42,860 --> 00:47:44,620
SQUAWKING

430
00:47:44,620 --> 00:47:48,100
At this time of year, the river
is their main source of water.

431
00:47:48,100 --> 00:47:49,860
GENTLE GROWLING

432
00:47:55,140 --> 00:47:56,940
It's where they drink and bathe.

433
00:47:59,140 --> 00:48:02,380
Today, they won't be bathing alone.

434
00:48:02,380 --> 00:48:05,900
Assuming they let Spy Elephant
join them.

435
00:48:05,900 --> 00:48:07,580
TRUMPETING

436
00:48:17,100 --> 00:48:21,060
They are notoriously shy,
so it's a sensitive moment.

437
00:48:29,900 --> 00:48:33,060
But he's soon closer
than ever thought possible.

438
00:48:53,860 --> 00:48:55,660
TRUMPETING

439
00:49:03,100 --> 00:49:04,740
It's mission accomplished.

440
00:49:06,260 --> 00:49:08,780
But who can resist
meeting a baby elephant?

441
00:49:21,340 --> 00:49:23,700
The reception could hardly be
more positive.

442
00:49:31,140 --> 00:49:33,060
A magical close encounter

443
00:49:33,060 --> 00:49:35,860
with one of Borneo's
rarest inhabitants.

444
00:49:43,780 --> 00:49:45,420
Then, as quickly as he came...

445
00:49:45,420 --> 00:49:46,620
TRUMPETING

446
00:49:48,060 --> 00:49:49,780
..he's gone.

447
00:49:53,140 --> 00:49:54,740
But not quite.

448
00:49:54,740 --> 00:49:55,980
SQUAWKING

449
00:49:57,260 --> 00:49:59,820
There's a downside of being
in the heart of the action.

450
00:50:10,420 --> 00:50:12,220
SQUAWKING

451
00:50:17,820 --> 00:50:20,980
Like all good spy creatures,
he carries on filming.

452
00:50:22,380 --> 00:50:23,820
TRUMPETING

453
00:50:24,860 --> 00:50:27,220
But he's certainly seen better days.

454
00:50:30,740 --> 00:50:32,260
BIRDSONG

455
00:50:33,780 --> 00:50:36,820
As the tropical year
turns full circle,

456
00:50:36,820 --> 00:50:41,020
the Peruvian coast is the venue
for another astonishing spectacle.

457
00:50:42,580 --> 00:50:45,820
Two million Guanay cormorants
nest here,

458
00:50:45,820 --> 00:50:50,420
attracted by the fertile Humboldt
Current that passes just offshore.

459
00:50:52,460 --> 00:50:56,260
It also sustains
an extraordinary tropical penguin -

460
00:50:56,260 --> 00:50:57,540
the Humboldt.

461
00:51:01,820 --> 00:51:04,620
The chicks' fathers
have yet to return from fishing.

462
00:51:04,620 --> 00:51:06,100
HONKING

463
00:51:06,100 --> 00:51:07,740
They are starving.

464
00:51:09,540 --> 00:51:11,540
But the waiting will soon be over.

465
00:51:16,260 --> 00:51:19,540
Spy Penguin prepares to meet
the returning males.

466
00:51:27,460 --> 00:51:31,100
They've been catching fish for days
to feed their chicks,

467
00:51:31,100 --> 00:51:35,300
but the hardest part of the journey
still lies ahead.

468
00:51:42,860 --> 00:51:44,860
First, a few formalities.

469
00:51:52,220 --> 00:51:55,340
Now, they face a trek
of over a mile.

470
00:51:57,060 --> 00:51:58,860
But there's a problem.

471
00:52:00,500 --> 00:52:03,340
Sea lions, and not just a few.

472
00:52:10,460 --> 00:52:12,700
There are 50,000 in all.

473
00:52:17,180 --> 00:52:19,580
Or is it 50,001?

474
00:52:21,580 --> 00:52:24,820
A spy, with cameras in both eyes.

475
00:52:27,500 --> 00:52:29,140
THEY SNORT

476
00:52:32,820 --> 00:52:35,420
It can even move to capture
the best angle.

477
00:52:41,300 --> 00:52:43,580
To feed their hungry chicks,

478
00:52:43,580 --> 00:52:46,340
the penguins must take on
the sea lions.

479
00:53:06,540 --> 00:53:08,940
It's so easy to put a foot wrong.

480
00:53:18,300 --> 00:53:19,940
GRUNTING

481
00:53:47,420 --> 00:53:49,980
Somehow, they make it through.

482
00:53:54,780 --> 00:53:57,380
But their problems
are far from over.

483
00:53:58,660 --> 00:54:01,620
The Atacama Desert
hugs the coastline.

484
00:54:01,620 --> 00:54:04,380
To reach their chicks,
they can't avoid it.

485
00:54:07,380 --> 00:54:09,500
Spy Penguin keeps them company

486
00:54:09,500 --> 00:54:13,140
as they tackle the driest
tropical desert in the world.

487
00:54:19,700 --> 00:54:22,500
They must pace themselves,
or risk overheating.

488
00:54:43,460 --> 00:54:46,260
Finally, their destination
is in sight.

489
00:54:47,300 --> 00:54:49,300
But, now, another problem.

490
00:54:53,580 --> 00:54:56,620
The two-million nesting cormorants.

491
00:54:59,500 --> 00:55:03,740
Their take-off zone lies right
in the path of the penguin colony.

492
00:55:06,780 --> 00:55:09,020
The returning penguins are trapped.

493
00:55:09,020 --> 00:55:11,860
Reaching their chicks
is now impossible.

494
00:55:14,100 --> 00:55:16,500
The mothers protect them
any way they can.

495
00:55:18,740 --> 00:55:20,860
THEY GROWL

496
00:55:25,980 --> 00:55:27,740
And still they come.

497
00:55:31,340 --> 00:55:33,980
The great exodus takes two hours.

498
00:55:43,620 --> 00:55:45,140
WAVES CRASH

499
00:55:49,380 --> 00:55:54,140
As calm returns, the valiant
penguins finally make it back.

500
00:56:05,500 --> 00:56:07,900
Their chicks are fed at last.

501
00:56:11,820 --> 00:56:15,460
It's also time
to put our spy creatures to rest.

502
00:56:20,340 --> 00:56:24,460
In Uganda, the great silverback
is making his bed for the night.

503
00:56:36,340 --> 00:56:38,900
A moment to relax
with family and friends.

504
00:56:43,260 --> 00:56:46,820
For mothers,
that's easier said than done.

505
00:56:50,180 --> 00:56:52,180
GRUNTING

506
00:56:56,140 --> 00:56:59,420
But, eventually, sleep comes to all.

507
00:57:05,420 --> 00:57:09,420
Even our spy
can finally stop filming.

508
00:57:12,700 --> 00:57:14,860
HE BREAKS WIND

509
00:57:17,420 --> 00:57:21,620
Next time - we travel to the lands
north of the Tropics,

510
00:57:21,620 --> 00:57:25,100
where life is governed by
the changing seasons.