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00:00:02,000 --> 00:00:05,380
The animal world is full
of spectacle and wonder.

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

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00:00:12,140 --> 00:00:16,380
To find out, our team of
spy creatures goes undercover.

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00:00:18,580 --> 00:00:22,700
They not only look like the animals
they film,

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they behave like them too.

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Armed with the latest
camera technology...

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..they are heading across the globe.

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From the heat of the tropics...

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..to the lands that lie
in the north.

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00:00:54,460 --> 00:00:57,220
From the islands
of the southern seas...

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..to the snow and ice
of the frozen poles...

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..our spies reveal
the astonishing variety

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of life that thrives there...

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..from inside their world.

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On their final assignment, our
spy creatures explore the lands

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00:01:26,780 --> 00:01:30,340
of ice and snow beyond the Arctic
and Antarctic Circles.

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In this polar realm, animals find
astonishing ways to survive

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in an extreme and freezing climate.

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00:01:51,500 --> 00:01:54,700
It's winter on the remote
island of South Georgia

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in the Southern Ocean.

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Spy albatross patrols the rugged
coast for signs of life.

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Even in this hostile land,
animals still thrive.

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A city of king penguins
and their chicks.

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200,000 in all.

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They're one of the world's tallest
penguins, standing 1m high.

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Among the multitude,
there's a special addition.

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PENGUINS BRAY

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Spy chick is here to reveal
life in the colony.

29
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In this barren land, the chicks
must stick together.

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Preening each other is
one way of making friends.

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Now a fully-fledged member
of the colony,

32
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he's free to find out more.

33
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Both parents care for their chicks,
feeding them fish

34
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stored in their stomachs.

35
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They're six months old.

36
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It will be eight more months
before they're fledged.

37
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No other penguin devotes so much
time to rearing their young.

38
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Sheathbills are one of the few
other birds to thrive here.

39
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They scavenge on anything they can.

40
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Even spy chick is worth a try.

41
00:04:37,900 --> 00:04:41,300
Sheathbills are more an
irritation than a threat.

42
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The chicks have far bigger
things to worry about.

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Giant petrels.

44
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He seeks out the weak and injured.

45
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His aim is to create panic...

46
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..separating a chick from
the colony.

47
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But parents work together to
shield any chick in danger.

48
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The petrel seeks an easier victim.

49
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Not the time for a malfunction.

50
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SPY CHICK WHIRS

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Luckily, there's plenty
of life left in spy chick.

52
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In a colony so vast,
the petrel will soon find

53
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a more appetising meal.

54
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Order restored, the chicks'
lives are about to change.

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Their parents' food stocks
have run out.

56
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There's nothing left to give.

57
00:06:50,180 --> 00:06:52,700
It's time to go fishing once more.

58
00:06:58,460 --> 00:07:03,260
The chicks won't see their parents
again for at least three months.

59
00:07:08,380 --> 00:07:11,140
Ahead lies the Southern Ocean,

60
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and a round trip of over
1,000 miles.

61
00:07:33,780 --> 00:07:37,580
The chicks must now face the
full brunt of the weather alone.

62
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It will be a long wait.

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Their next meal is many months away.

64
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As our penguin chicks hunker
down for winter,

65
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spring is arriving in the
Arctic's far north.

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Icebergs, cast adrift from glaciers,

67
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are sculpted by rising temperatures.

68
00:08:10,860 --> 00:08:14,940
What once was frozen sea
now gives way to open water.

69
00:08:17,420 --> 00:08:19,900
Only rafts of drifting ice remain.

70
00:08:21,620 --> 00:08:24,740
But it's not just the ice
that's on the move.

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Spy walrus is perfectly suited
for navigating these waters.

72
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Based on a young walrus, it should
be readily accepted.

73
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This is just what it's looking for.

74
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Atlantic walrus hold out
on what little ice remains.

75
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A new walrus is always of interest.

76
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This small family pod has been
at sea all winter.

77
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They gave birth when the water
was frozen.

78
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Ice still provides a safe
platform to rest on...

79
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..but now there's not enough
room for everyone.

80
00:09:29,500 --> 00:09:33,740
Fortunately, the male is quite happy
to snooze in the ocean.

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LOUD SNORING

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And he doesn't mind
letting everyone know.

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PARPING

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GRUNTING

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He needs his sleep.

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Walrus can stay awake for four days
when searching for food.

87
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He can dose for ten hours
at a time,

88
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only waking to change position.

89
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He's even happy to sleep
on his front...

90
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..despite needing a breath
every ten minutes.

91
00:10:40,980 --> 00:10:44,260
Male walrus are notoriously grumpy.

92
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But most of it's just for show.

93
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KNOCKING

94
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This strange knocking sound
is a warning to rival males.

95
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It can carry ten miles or more.

96
00:11:18,820 --> 00:11:23,540
Back with the walrus family, their
ice raft is fast disappearing.

97
00:11:25,260 --> 00:11:27,060
Time to find dry land.

98
00:11:28,660 --> 00:11:31,380
But first, they check out
the new visitor.

99
00:11:33,660 --> 00:11:37,740
Walruses use their tusks
for finding food and fighting.

100
00:11:37,740 --> 00:11:40,860
But they have only friendly
intentions here.

101
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Inspection over, the family look
for a safer place to haul out.

102
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They're joined by spy gyrfalcon,

103
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based on the only falcon found
this far north.

104
00:12:08,380 --> 00:12:12,860
In the water, the calf
is vulnerable to predators.

105
00:12:12,860 --> 00:12:16,100
For security, the family
keep him surrounded.

106
00:12:19,580 --> 00:12:23,820
They may travel over 200 miles
without stopping or sleeping.

107
00:12:27,540 --> 00:12:30,180
But today, they're not going far.

108
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Their favourite beach is close by.

109
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A popular spot with shallow waters
rich in clams and other food...

110
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..this will be their
summer home until the ice returns.

111
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There are some who choose
to follow the retreating ice.

112
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Spy falcon heads further north...

113
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..the frozen realm of the world's
most formidable predator.

114
00:13:15,580 --> 00:13:18,540
Polar bears use the ice for hunting.

115
00:13:22,940 --> 00:13:26,660
But each year the spring melt
arrives earlier,

116
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making conditions more challenging.

117
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She must use the fragile
ice as stepping stones.

118
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To gain a closer look,
another spy is needed.

119
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It could be a risky mission.

120
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The planet's largest carnivore
has a fearsome reputation...

121
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..and they like to hunt alone.

122
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As a precaution, spy bear
has a nifty trick.

123
00:14:49,060 --> 00:14:52,220
Fortunately, polar bears
aren't territorial.

124
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They're more inquisitive
than aggressive.

125
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The bear continues her quest
for seals...

126
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..slipping into the water
with hardly a stir.

127
00:15:21,180 --> 00:15:26,660
Hidden between the ice floes,
she can move quickly and silently.

128
00:15:26,660 --> 00:15:30,620
But seals haul out where they
can see bears approaching.

129
00:15:32,140 --> 00:15:35,180
And this seal has met
polar bears before...

130
00:15:37,260 --> 00:15:39,220
..with the scars to prove it.

131
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She must use what cover she can.

132
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She takes a bearing and dives.

133
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She aims for a surprise attack.

134
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That means getting close.

135
00:16:09,660 --> 00:16:12,100
But there's too much ice to cover.

136
00:16:18,420 --> 00:16:20,660
She must change her technique.

137
00:16:27,780 --> 00:16:29,940
Keeping downwind gives
her the advantage.

138
00:16:31,860 --> 00:16:35,180
But hunting on melting ice
has its own problems.

139
00:16:52,580 --> 00:16:55,580
She spreads her weight as best
she can.

140
00:17:01,060 --> 00:17:02,900
But this wasn't in the plan.

141
00:17:22,020 --> 00:17:24,820
When the ice is melting,
most hunts fail.

142
00:17:44,500 --> 00:17:47,980
Rolling squeezes water
from her fur,

143
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vital for maintaining insulation.

144
00:17:57,820 --> 00:17:59,780
Perhaps all is not lost.

145
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She's picked up a scent.

146
00:18:03,820 --> 00:18:05,780
A trail that leads to land.

147
00:18:13,420 --> 00:18:16,140
She can smell food from
20 miles away.

148
00:18:18,660 --> 00:18:20,700
But the trail ends here.

149
00:18:25,020 --> 00:18:27,540
A whale carcass.

150
00:18:31,300 --> 00:18:37,540
100 tonnes of blubber, and a beacon
for every bear in the neighbourhood,

151
00:18:37,540 --> 00:18:39,420
including our spy.

152
00:18:45,380 --> 00:18:48,100
The hungry bear soon joins
the feast.

153
00:18:56,580 --> 00:19:00,300
When there's plenty of food,
they don't mind sharing.

154
00:19:01,980 --> 00:19:04,260
Here, there's enough to last
them a year.

155
00:19:14,580 --> 00:19:18,820
As the climate changes, such
bonanzas become life-savers

156
00:19:18,820 --> 00:19:20,780
for hungry bears.

157
00:19:25,580 --> 00:19:30,100
Further south, beyond the sea ice,
is Norway's Hornoya Island.

158
00:19:32,540 --> 00:19:36,660
It's early spring and millions of
seabirds are returning to breed,

159
00:19:36,660 --> 00:19:39,300
having spent winter fishing at sea.

160
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Among them is the island's
most famous inhabitant.

161
00:19:52,660 --> 00:19:54,780
Puffins are rarely seen on snow,

162
00:19:54,780 --> 00:19:59,260
but here winter lingers
far into spring.

163
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To gain a head start, they must
pair up as soon as they can.

164
00:20:04,940 --> 00:20:08,980
But one puffin is very much
on its own.

165
00:20:08,980 --> 00:20:10,980
A spy in disguise.

166
00:20:12,220 --> 00:20:14,660
It isn't lonely for long.

167
00:20:22,660 --> 00:20:25,260
Puffins are sociable
and inquisitive.

168
00:20:33,380 --> 00:20:36,380
Spy puffin greets
them with a head flick.

169
00:20:38,380 --> 00:20:40,700
And they soon return the gesture.

170
00:21:07,780 --> 00:21:12,340
He's surrounded by males searching
for their long-lost partners.

171
00:21:13,820 --> 00:21:16,900
They pair for life, but only
spend time together

172
00:21:16,900 --> 00:21:18,580
in the breeding season.

173
00:21:20,100 --> 00:21:23,900
After so long apart,
it's hard to recognise who's who.

174
00:21:33,700 --> 00:21:36,500
Even spy puffin is given
the once over.

175
00:21:54,420 --> 00:21:58,660
The male waits by his old nest
burrow hidden beneath the snow.

176
00:22:00,700 --> 00:22:03,340
This is where his partner
will return.

177
00:22:04,740 --> 00:22:06,380
Could this be her?

178
00:22:08,620 --> 00:22:10,100
Or maybe her?

179
00:22:12,540 --> 00:22:13,900
Or even her?

180
00:22:17,740 --> 00:22:20,740
There's only one way to find out.

181
00:22:20,740 --> 00:22:22,820
They bob and head rub.

182
00:22:30,780 --> 00:22:32,580
She's definitely the one.

183
00:22:35,660 --> 00:22:39,900
But a male who's young and single
is out to try his luck.

184
00:22:43,780 --> 00:22:46,900
He'll happily muscle
in on a devoted couple.

185
00:22:51,740 --> 00:22:55,860
But no male gives up the love
of his life without a fight.

186
00:23:03,300 --> 00:23:07,340
Despite her commitment, a strong
male might turn her head.

187
00:23:08,980 --> 00:23:11,980
Her partner must prove
he's still worthy.

188
00:23:44,300 --> 00:23:46,140
The love rival loses.

189
00:23:52,020 --> 00:23:55,060
Her mate has proved
he's still a good catch.

190
00:24:02,380 --> 00:24:06,620
Bonds restored, they join others
as they go fishing.

191
00:24:32,860 --> 00:24:36,940
Back in South Georgia, four months
have passed and the chicks

192
00:24:36,940 --> 00:24:40,220
are still waiting for their parents
to return.

193
00:24:43,220 --> 00:24:47,220
With warming seas, the fishing
grounds are moving south,

194
00:24:47,220 --> 00:24:50,220
meaning their parents must
travel further.

195
00:24:51,820 --> 00:24:55,380
Despite their fluffy appearance,
some have lost 70%

196
00:24:55,380 --> 00:24:57,180
of their fat reserves.

197
00:24:58,740 --> 00:25:00,700
Close to starvation,

198
00:25:00,700 --> 00:25:04,300
they must conserve the little
energy they have.

199
00:25:10,060 --> 00:25:13,020
But their wait may soon be over.

200
00:25:24,420 --> 00:25:26,580
The first promising sign.

201
00:25:35,020 --> 00:25:38,460
They've been away for a third
of a year and are desperate

202
00:25:38,460 --> 00:25:40,460
to feed their hungry chicks.

203
00:25:43,540 --> 00:25:47,580
Another penguin cam is here
to greet the weary travellers.

204
00:25:50,620 --> 00:25:53,860
Their bellies are stuffed
with squid and krill.

205
00:25:58,500 --> 00:26:02,620
Over the next few days, hundreds
of thousands will return.

206
00:26:06,260 --> 00:26:09,740
But while they were away,
things have changed.

207
00:26:13,380 --> 00:26:15,540
Their beach has been invaded.

208
00:26:17,500 --> 00:26:22,100
6,000 elephant seals now separate
them from their hungry chicks.

209
00:26:29,260 --> 00:26:31,060
Spy chick is waiting too.

210
00:26:39,980 --> 00:26:43,900
It won't be easy - the bulls weigh
four tonnes

211
00:26:43,900 --> 00:26:45,660
and are easily riled.

212
00:26:55,220 --> 00:26:58,060
The penguins will just have to wait.

213
00:27:12,940 --> 00:27:16,660
As peace returns, it's
the opportunity they need.

214
00:27:24,420 --> 00:27:26,500
Safest to go on tiptoe.

215
00:27:50,060 --> 00:27:51,700
So far, so good.

216
00:27:58,180 --> 00:28:00,020
Maybe not so good.

217
00:28:20,860 --> 00:28:22,380
It's now or never!

218
00:28:44,180 --> 00:28:47,540
He's cleared the way -
it's the break they need.

219
00:28:50,820 --> 00:28:53,420
But that was the easy bit.

220
00:28:58,980 --> 00:29:01,580
Somehow they must find their
own chick

221
00:29:01,580 --> 00:29:04,420
among all the identikit versions.

222
00:29:18,700 --> 00:29:20,740
A seemingly impossible task.

223
00:29:32,220 --> 00:29:34,340
Especially as their chicks
have changed

224
00:29:34,340 --> 00:29:36,420
over the last four months.

225
00:29:37,740 --> 00:29:39,540
But they have a solution...

226
00:29:39,540 --> 00:29:41,780
PENGUIN CALLS

227
00:29:45,460 --> 00:29:48,780
..call and hope their chick
answers back.

228
00:29:53,980 --> 00:29:56,340
Each parent's call is unique.

229
00:29:57,460 --> 00:30:01,700
Once identified, the chick can't
contain his excitement.

230
00:30:10,740 --> 00:30:14,980
After so long apart, it's a moment
worth celebrating.

231
00:30:27,500 --> 00:30:29,100
Food at last!

232
00:30:32,100 --> 00:30:34,660
Preservatives in her stomach mean
it's as fresh

233
00:30:34,660 --> 00:30:36,660
as the day it was caught.

234
00:30:41,140 --> 00:30:44,180
With full bellies and their
parents around,

235
00:30:44,180 --> 00:30:47,780
the chicks will be safe for another
few months.

236
00:30:55,060 --> 00:30:58,580
On the Arctic islands of Svalbard,
young seabirds

237
00:30:58,580 --> 00:31:00,580
face a different challenge.

238
00:31:05,100 --> 00:31:08,340
It's now summer, and guillemots are
among the many birds

239
00:31:08,340 --> 00:31:10,380
raising their young.

240
00:31:13,140 --> 00:31:16,860
An Arctic fox bears witness
to this yearly spectacle.

241
00:31:27,460 --> 00:31:31,980
Among the returning flocks, our
spy is surrounded by little auks.

242
00:31:34,540 --> 00:31:37,180
They nest among the boulders.

243
00:31:44,060 --> 00:31:47,580
While Guillemots nest on the
sheer cliffs above.

244
00:31:50,820 --> 00:31:54,260
All this life brings opportunities
for predators.

245
00:31:55,900 --> 00:31:59,140
Spy fox is staking out a den
of Arctic foxes.

246
00:32:08,300 --> 00:32:11,500
These youngsters have been raised
here over the last three months.

247
00:32:13,300 --> 00:32:15,180
Now they're coming of age,

248
00:32:15,180 --> 00:32:18,380
they play the games that hone
their hunting skills.

249
00:32:28,500 --> 00:32:33,020
High above, the guillemot chicks
are ready to leave their nests.

250
00:32:40,340 --> 00:32:42,500
Below is a drop of 300m,

251
00:32:42,500 --> 00:32:45,380
and there's only one way down.

252
00:32:47,820 --> 00:32:50,900
Somehow, they must make
it to the sea.

253
00:32:55,180 --> 00:32:57,580
The chick has never flown before.

254
00:33:06,780 --> 00:33:08,980
But her father is with her
all the way.

255
00:33:12,340 --> 00:33:15,060
Falling short is
the greatest danger.

256
00:33:24,620 --> 00:33:27,140
But she makes a textbook landing.

257
00:33:30,340 --> 00:33:32,540
More are encouraged to follow.

258
00:33:45,620 --> 00:33:49,420
For the foxes, they're tantalisingly
out of reach.

259
00:34:01,060 --> 00:34:04,340
While the youngsters hope
for better luck,

260
00:34:04,340 --> 00:34:07,060
boulder cam takes over
filming duties.

261
00:34:09,900 --> 00:34:13,180
It's just one of the many
spycams hidden here.

262
00:34:19,420 --> 00:34:22,100
For now, the fox cubs bide
their time.

263
00:34:26,580 --> 00:34:29,820
Above, more novice flyers
are warming up.

264
00:34:31,500 --> 00:34:34,780
Ready or not, she must make
the leap of faith.

265
00:34:54,060 --> 00:34:55,620
She falls short.

266
00:34:57,020 --> 00:34:59,060
An opportunity for the fox.

267
00:35:04,700 --> 00:35:08,060
The chick is still 300m
from the sea,

268
00:35:08,060 --> 00:35:10,260
but her father's calls
are beckoning her.

269
00:35:18,500 --> 00:35:20,620
She's in a race for her life.

270
00:35:23,300 --> 00:35:26,820
To keep up, another
spy creature is needed,

271
00:35:26,820 --> 00:35:28,980
one based on a snowy owl.

272
00:35:30,780 --> 00:35:33,220
The chick might seem an easy meal...

273
00:35:36,420 --> 00:35:38,460
..but this meal bites back.

274
00:35:45,420 --> 00:35:48,460
It's running rings round
this novice hunter.

275
00:35:54,740 --> 00:35:56,340
But there's a long way to go.

276
00:35:57,420 --> 00:36:01,460
To reach the sea, the chick must
cross the boulder field.

277
00:36:10,380 --> 00:36:12,900
And danger lurks wherever she turns.

278
00:36:19,100 --> 00:36:20,940
But this bird has spirit.

279
00:36:28,300 --> 00:36:30,980
And the boulders offer
places to hide.

280
00:36:44,180 --> 00:36:46,940
All the time, she's edging closer
to the sea.

281
00:36:50,220 --> 00:36:53,420
It seems her bravado is outfoxing
the fox.

282
00:37:17,780 --> 00:37:19,620
But she's not safe yet.

283
00:37:30,540 --> 00:37:32,180
She's made it.

284
00:37:33,980 --> 00:37:35,900
A hard lesson for the fox.

285
00:37:37,100 --> 00:37:38,940
A happy reunion for the chick.

286
00:37:41,100 --> 00:37:44,460
She'll return to the cliffs
in five years' time,

287
00:37:44,460 --> 00:37:46,460
when she is ready to breed.

288
00:37:48,100 --> 00:37:51,220
By then, the fox cubs
will be seasoned hunters.

289
00:37:56,620 --> 00:37:58,980
While it's summer in the Arctic,

290
00:37:58,980 --> 00:38:01,380
Antarctica is facing the
lowest temperatures found

291
00:38:01,380 --> 00:38:03,300
anywhere else on Earth.

292
00:38:08,420 --> 00:38:13,060
Remarkably, emperor penguins choose
this time to have their young.

293
00:38:19,380 --> 00:38:21,820
This tobogganing version
of penguin cam

294
00:38:21,820 --> 00:38:24,340
is here to discover
how they survive.

295
00:38:39,340 --> 00:38:42,100
As temperatures reach
40 degrees below,

296
00:38:42,100 --> 00:38:46,380
the chicks try to tuck themselves
into their mother's pouch.

297
00:38:49,660 --> 00:38:52,700
As the blizzard strengthens,
their parents turn their backs

298
00:38:52,700 --> 00:38:54,700
to the biting wind.

299
00:39:04,060 --> 00:39:06,060
But even this is not enough.

300
00:39:18,460 --> 00:39:21,260
To stay warm, they must
huddle together.

301
00:39:30,500 --> 00:39:32,900
A chick on its own
won't survive for long.

302
00:39:44,420 --> 00:39:45,820
Just in time.

303
00:39:50,220 --> 00:39:53,580
But he urgently needs the warmth
of the huddle.

304
00:40:01,380 --> 00:40:04,220
His mother must find a place
to tuck in.

305
00:40:15,100 --> 00:40:19,220
In the jostle for position,
accidents are inevitable.

306
00:40:26,340 --> 00:40:29,980
His mother's only thought
is to protect him from harm.

307
00:40:34,660 --> 00:40:37,900
It's not the only danger he faces.

308
00:40:37,900 --> 00:40:42,300
Here, winds can reach 100mph for
days at a time.

309
00:40:45,980 --> 00:40:49,660
Spy penguin is facing the
full force of the weather.

310
00:41:01,900 --> 00:41:06,540
While penguin cam is out of action,
other cameras take over the filming.

311
00:41:09,220 --> 00:41:11,860
Time-lapse
unravels the huddle's secrets.

312
00:41:14,860 --> 00:41:17,300
Somehow, they must share the warmth.

313
00:41:19,740 --> 00:41:22,180
But the last to join are stuck
on the outside,

314
00:41:22,180 --> 00:41:24,220
taking the brunt of the storm.

315
00:41:29,620 --> 00:41:31,260
But there's help.

316
00:41:31,260 --> 00:41:33,540
Those on the inside take tiny steps

317
00:41:33,540 --> 00:41:35,660
that move the huddle in waves.

318
00:41:38,940 --> 00:41:40,460
Step by step, the penguins move

319
00:41:40,460 --> 00:41:43,140
from the inside to the outside.

320
00:41:48,580 --> 00:41:50,780
In this way, the warmest penguins

321
00:41:50,780 --> 00:41:52,420
soon cover the coolest birds.

322
00:41:55,260 --> 00:41:57,100
By rotating position,

323
00:41:57,100 --> 00:41:59,780
no penguin is left out in the cold

324
00:41:59,780 --> 00:42:02,300
and all get a turn
in the warm centre.

325
00:42:04,180 --> 00:42:05,860
The huddle is so efficient

326
00:42:05,860 --> 00:42:08,220
penguins at the inner core
often overheat.

327
00:42:10,900 --> 00:42:12,740
Then the colony breaks down.

328
00:42:15,020 --> 00:42:17,260
The coldest penguins
now form a new huddle.

329
00:42:28,420 --> 00:42:32,460
As others join, they soon become
warm and snug once more.

330
00:42:36,980 --> 00:42:39,980
When the blizzard ends,
the penguins separate.

331
00:42:43,220 --> 00:42:45,660
Our spy can join them once more.

332
00:42:57,860 --> 00:42:59,580
The chicks have made it.

333
00:43:01,460 --> 00:43:04,340
They now take a little ice and snow
in their stride.

334
00:43:25,700 --> 00:43:27,700
As Antarctica freezes,

335
00:43:27,700 --> 00:43:30,740
it's midsummer in Ellesmere Island,

336
00:43:30,740 --> 00:43:33,740
just 500 miles from the North Pole.

337
00:43:33,740 --> 00:43:36,380
It's home to the Arctic wolf,

338
00:43:36,380 --> 00:43:38,460
the world's most successful
pack hunter.

339
00:43:42,420 --> 00:43:44,380
Summer is pupping season.

340
00:43:48,340 --> 00:43:50,300
After three months in the den,

341
00:43:50,300 --> 00:43:52,700
they're big enough
for the great outdoors.

342
00:43:56,540 --> 00:43:58,260
There's so much to see.

343
00:44:02,060 --> 00:44:03,420
Spy pup.

344
00:44:05,900 --> 00:44:07,940
A new companion, perhaps.

345
00:44:17,340 --> 00:44:20,340
A bow and wagging tail means
come and play.

346
00:44:24,180 --> 00:44:26,100
Already, they've made a friend.

347
00:44:43,780 --> 00:44:46,460
The pups are big enough to meet
the rest of the family.

348
00:44:54,700 --> 00:44:57,700
Their older brothers and sisters
now have young playmates.

349
00:45:05,460 --> 00:45:07,660
Their parents
share in leadership duties.

350
00:45:07,660 --> 00:45:10,060
DUAL HOWLING

351
00:45:10,060 --> 00:45:12,460
They rally the family to go hunting.

352
00:45:16,820 --> 00:45:19,420
When all are ready,
they leave together.

353
00:45:24,140 --> 00:45:25,940
Spy pup tries to follow.

354
00:45:30,420 --> 00:45:32,980
But it's no match for the agile
wolves.

355
00:45:49,580 --> 00:45:52,620
Spy snowy owl takes up
the filming baton.

356
00:45:54,820 --> 00:45:58,220
It can fly long-range and cruise
at 15mph...

357
00:46:00,100 --> 00:46:02,900
..perfect for tracking wolves
on the move.

358
00:46:10,260 --> 00:46:13,260
They have 75,000 square miles
to hunt in.

359
00:46:17,140 --> 00:46:18,540
The head into wind

360
00:46:18,540 --> 00:46:20,220
to try to catch a scent...

361
00:46:21,780 --> 00:46:26,060
..perhaps from prey 20 miles away.

362
00:46:26,060 --> 00:46:29,100
It's a testing time
for such tiny pups.

363
00:46:31,740 --> 00:46:33,980
To discover what lies ahead,

364
00:46:33,980 --> 00:46:36,540
our eye in the sky takes the lead.

365
00:46:40,900 --> 00:46:43,940
Muskox are prime prey
for Arctic wolves.

366
00:46:51,980 --> 00:46:55,100
Downwind, the wolves are difficult
to detect.

367
00:47:00,420 --> 00:47:02,580
But muskox are easily spooked.

368
00:47:09,100 --> 00:47:11,580
So they carefully take up position.

369
00:47:18,860 --> 00:47:21,100
Selecting the young or infirm.

370
00:47:23,540 --> 00:47:26,380
But the pups have yet
to learn the rules.

371
00:47:26,380 --> 00:47:27,420
PUPS YAP

372
00:47:31,620 --> 00:47:32,940
Their cover's blown.

373
00:47:36,340 --> 00:47:37,980
The herd cluster together...

374
00:47:47,580 --> 00:47:50,340
..forming a protective circle
around their calves.

375
00:47:52,500 --> 00:47:54,060
The wolves surround them.

376
00:47:58,060 --> 00:48:00,500
This time, the pups stay still.

377
00:48:04,780 --> 00:48:06,820
The pack calculates its next move.

378
00:48:18,260 --> 00:48:19,620
They split the herd.

379
00:48:23,860 --> 00:48:26,060
As the pups watch and learn.

380
00:48:28,820 --> 00:48:31,500
They've singled out
the oldest animal.

381
00:48:33,620 --> 00:48:35,500
But a fully grown muskox

382
00:48:35,500 --> 00:48:37,740
weighs 400 kilos and can kill a
wolf.

383
00:48:41,180 --> 00:48:44,580
And its thick woolly coat
is almost impenetrable.

384
00:48:47,020 --> 00:48:49,060
Their aim is to tire her out.

385
00:48:58,260 --> 00:49:01,660
Those at the front keep
the muskox distracted.

386
00:49:02,700 --> 00:49:04,700
Those at the back anchor her down.

387
00:49:23,180 --> 00:49:25,300
Such battles can last an hour.

388
00:49:35,300 --> 00:49:37,820
Exhausted, she gives up the fight.

389
00:49:41,540 --> 00:49:43,940
It's enough food for the whole
family,

390
00:49:43,940 --> 00:49:45,980
including the pups.

391
00:49:45,980 --> 00:49:47,380
But they must wait -

392
00:49:47,380 --> 00:49:49,060
the hunters get the first reward.

393
00:49:53,100 --> 00:49:54,700
Once they've had their fill,

394
00:49:54,700 --> 00:49:57,140
the cubs are called.

395
00:49:57,140 --> 00:49:58,980
They're curious.

396
00:49:58,980 --> 00:50:01,380
It's the first time they've tasted
fresh meat.

397
00:50:09,940 --> 00:50:12,700
It's also their first lesson
in survival.

398
00:50:22,060 --> 00:50:25,580
Back at the den, spy pup is waiting.

399
00:50:25,580 --> 00:50:27,780
The pups return with spoils
from the hunt.

400
00:50:34,940 --> 00:50:38,540
For all, the meal will keep
hunger at bay for a week.

401
00:50:41,300 --> 00:50:43,260
It's now time to relax once more.

402
00:50:51,780 --> 00:50:54,420
Before our spy creatures'
mission ends,

403
00:50:54,420 --> 00:50:56,620
they return to South Georgia.

404
00:50:58,900 --> 00:51:01,380
Spy king penguin is on duty
once more.

405
00:51:03,940 --> 00:51:06,620
It's the elephant seals'
breeding season

406
00:51:06,620 --> 00:51:09,140
and females with pups
are everywhere.

407
00:51:11,700 --> 00:51:14,540
It's a busy time for this
beach master.

408
00:51:14,540 --> 00:51:17,020
He has around 100 females
to look after.

409
00:51:20,740 --> 00:51:23,140
Each is in need of attention.

410
00:51:23,140 --> 00:51:24,660
He doesn't want them to stray.

411
00:51:31,140 --> 00:51:32,980
But while his back is turned,

412
00:51:32,980 --> 00:51:34,420
he's vulnerable.

413
00:51:38,060 --> 00:51:39,460
There are plenty of other males

414
00:51:39,460 --> 00:51:40,740
hoping to steal them away.

415
00:51:42,780 --> 00:51:44,380
This one isn't big enough

416
00:51:44,380 --> 00:51:46,020
to challenge the beach master.

417
00:51:52,660 --> 00:51:54,300
He has to be sneaky instead.

418
00:51:57,380 --> 00:51:59,380
But the beach master is
always on guard.

419
00:52:00,620 --> 00:52:02,020
He roars a warning.

420
00:52:05,700 --> 00:52:07,300
His nose amplifies the sound.

421
00:52:10,580 --> 00:52:12,180
For the intruder,

422
00:52:12,180 --> 00:52:13,780
the message is loud and clear.

423
00:52:17,700 --> 00:52:19,300
It's followed up with a charge.

424
00:52:29,420 --> 00:52:30,660
The rival backs down.

425
00:52:33,820 --> 00:52:36,340
Spy penguin
becomes the first casualty

426
00:52:36,340 --> 00:52:38,180
as the rival makes his escape.

427
00:52:45,340 --> 00:52:47,380
With a spy creature down,

428
00:52:47,380 --> 00:52:48,740
backup is required.

429
00:52:51,580 --> 00:52:53,420
Meet the largest spy yet.

430
00:52:59,540 --> 00:53:01,860
To cope with his massive bulk,

431
00:53:01,860 --> 00:53:03,580
he's an inflatable version.

432
00:53:06,900 --> 00:53:08,620
His head is filled with water

433
00:53:08,620 --> 00:53:09,860
for added stability.

434
00:53:14,180 --> 00:53:15,980
He seems to fit right in.

435
00:53:19,420 --> 00:53:22,900
While the beach master recovers
from his brawl,

436
00:53:22,900 --> 00:53:26,140
the young male considers his next
move.

437
00:53:29,460 --> 00:53:31,380
It's worth another try.

438
00:53:41,180 --> 00:53:43,140
He must be as discreet as he can.

439
00:53:48,620 --> 00:53:50,700
But that requires a willing partner.

440
00:53:59,900 --> 00:54:02,500
He's been rumbled, and he knows it.

441
00:54:05,340 --> 00:54:06,740
This is an act of war.

442
00:54:10,820 --> 00:54:12,460
As the rival retreats,

443
00:54:12,460 --> 00:54:14,260
the female leaves the battleground.

444
00:54:19,340 --> 00:54:21,420
They must fight once more,

445
00:54:21,420 --> 00:54:24,660
with spy elephant seal
in the very heart of it.

446
00:54:24,660 --> 00:54:28,300
ROARING

447
00:54:28,300 --> 00:54:30,940
The beach master rises
to full height.

448
00:54:34,580 --> 00:54:36,260
Let the battle commence.

449
00:54:52,860 --> 00:54:54,180
Fighting can be lethal.

450
00:55:07,580 --> 00:55:10,500
Outmatched,
his rival retreats again.

451
00:55:15,500 --> 00:55:18,060
Another victory
for the heavyweight champion.

452
00:55:24,900 --> 00:55:27,300
He'll spend the whole summer
fighting.

453
00:55:27,300 --> 00:55:29,460
Every day is another battle.

454
00:55:37,740 --> 00:55:39,980
Despite being in the danger zone,

455
00:55:39,980 --> 00:55:41,420
our spy survived.

456
00:55:44,260 --> 00:55:45,700
But the young pretender

457
00:55:45,700 --> 00:55:47,300
still has some fight left in him.

458
00:55:49,980 --> 00:55:52,580
Best he picks on
someone his own size.

459
00:56:12,900 --> 00:56:14,780
It didn't stand a chance.

460
00:56:19,220 --> 00:56:20,620
It's a deflated end

461
00:56:20,620 --> 00:56:22,260
for spy elephant seal.

462
00:56:22,260 --> 00:56:23,260
AIR WHOOSHES

463
00:56:25,820 --> 00:56:28,340
As ever, the sheathbill
won't miss an opportunity.

464
00:56:30,820 --> 00:56:32,980
For a moment,
he's king of the castle.

465
00:56:38,060 --> 00:56:40,340
Despite its early demise,

466
00:56:40,340 --> 00:56:43,940
spy elephant seal was part
of something remarkable.

467
00:56:45,620 --> 00:56:47,860
With the help of new technology,

468
00:56:47,860 --> 00:56:51,660
our spy creatures joined
animal families to discover

469
00:56:51,660 --> 00:56:54,020
how they survive
in every part of the world.

470
00:56:55,820 --> 00:56:57,420
Wherever they went,

471
00:56:57,420 --> 00:57:00,540
they gave us an intimate view
of animal life

472
00:57:00,540 --> 00:57:03,300
and captured behaviour
never seen before.

473
00:57:05,100 --> 00:57:07,940
What they filmed made us smile.

474
00:57:07,940 --> 00:57:09,140
And made us wonder.

475
00:57:10,780 --> 00:57:12,620
They even touched our hearts.

476
00:57:15,220 --> 00:57:18,900
But in the end, the animals
told their own stories

477
00:57:18,900 --> 00:57:20,580
while our animatronic team

478
00:57:20,580 --> 00:57:25,820
brought new insights into the
animals that share our planet,

479
00:57:25,820 --> 00:57:28,260
with many adventures along the way.