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00:00:45,962 --> 00:00:50,342
The frozen seas
are worlds unto themselves.
3
00:00:50,508 --> 00:00:53,178
Beneath their ceiling of ice,
4
00:00:53,345 --> 00:00:56,473
they have an eerie,
almost magical stillness,
5
00:00:56,639 --> 00:00:59,684
cut off from the storms
that rage above.
6
00:01:03,938 --> 00:01:08,318
In the winter, the feeble slanting
rays of the sun bring little warmth
7
00:01:08,485 --> 00:01:13,156
and the temperature seldom rises
above minus 50 degrees Centigrade.
8
00:01:13,323 --> 00:01:15,408
(HOWLING, WHISTLING WIND)
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00:01:27,170 --> 00:01:31,132
For much of the year,
it is dark and cripplingly cold.
10
00:01:31,299 --> 00:01:34,719
Yet, there IS life here
at BOTH ends of the earth -
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00:01:34,886 --> 00:01:38,348
the Arctic and the Antarctic.
12
00:01:48,400 --> 00:01:52,028
For most animals, whether
they live in or out of water,
13
00:01:52,195 --> 00:01:55,156
the winters,
when much of the sea is frozen,
14
00:01:55,323 --> 00:01:57,283
bring the greatest challenge.
15
00:02:01,246 --> 00:02:03,331
The northern hemisphere.
16
00:02:03,498 --> 00:02:05,041
It's February,
17
00:02:05,208 --> 00:02:07,544
and as the earth tilts on its axis,
18
00:02:07,711 --> 00:02:10,338
the sun's rays
creep slowly northwards
19
00:02:10,505 --> 00:02:13,550
and the Arctic emerges
from its harsh winter.
20
00:02:17,262 --> 00:02:21,099
The Arctic is a frozen ocean
surrounded by continents,
21
00:02:21,266 --> 00:02:24,686
and when the surface of the sea
between the continents
22
00:02:24,853 --> 00:02:26,688
freezes from shore to shore,
23
00:02:26,855 --> 00:02:29,357
land predators walk out onto it
24
00:02:29,524 --> 00:02:31,026
to hunt.
25
00:02:36,614 --> 00:02:38,700
It's early March,
26
00:02:38,867 --> 00:02:41,494
and the sea is still covered
with ice...
27
00:02:42,162 --> 00:02:45,290
But there are patches
of open water - polynyas -
28
00:02:45,457 --> 00:02:47,167
that never freeze over.
29
00:02:47,334 --> 00:02:51,755
Here, where tidal currents
are squeezed between islands,
30
00:02:51,921 --> 00:02:55,759
the water movement is so strong
that ice cannot form.
31
00:03:01,222 --> 00:03:04,351
Walruses spend the winter
in polynyas.
32
00:03:05,435 --> 00:03:08,313
Here they have permanent access
to the air,
33
00:03:08,480 --> 00:03:12,567
but they can also retreat
to the sea to shelter, to hunt.
34
00:03:26,331 --> 00:03:30,460
Other sea mammals overwinter
in polynyas as well - in this one,
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00:03:30,627 --> 00:03:32,712
a young bowhead whale.
36
00:03:42,722 --> 00:03:44,891
Here, the current is really fast
37
00:03:45,058 --> 00:03:47,143
and the shifting ice is dangerous.
38
00:03:52,816 --> 00:03:54,901
This whale became trapped
39
00:03:55,068 --> 00:03:57,779
when ice encircled it last autumn.
40
00:04:04,994 --> 00:04:07,080
There is no food here,
41
00:04:07,247 --> 00:04:09,582
but a whale must breathe,
42
00:04:09,749 --> 00:04:14,838
and the only place it can do so
for miles around is in this tiny hole.
43
00:04:18,133 --> 00:04:21,094
It's living entirely
on its reserves of fat,
44
00:04:21,261 --> 00:04:23,763
but now, they're dangerously low.
45
00:04:23,930 --> 00:04:27,058
It will be some months yet
before it can escape.
46
00:04:41,281 --> 00:04:44,576
Elsewhere, other whales
have also been trapped.
47
00:04:44,743 --> 00:04:46,536
These are belugas.
48
00:04:46,703 --> 00:04:48,788
Their tiny hole in the ice
49
00:04:48,955 --> 00:04:51,291
has been kept open not by currents,
50
00:04:51,458 --> 00:04:54,294
but by the belugas'
continuous movements
51
00:04:54,461 --> 00:04:56,254
as they rise to breathe.
52
00:05:02,052 --> 00:05:05,221
Open water is now
some 20 miles away.
53
00:05:05,764 --> 00:05:09,017
It will be two months yet
before the ice melts.
54
00:05:21,488 --> 00:05:23,823
The belugas are extremely thin
55
00:05:23,990 --> 00:05:26,701
and most of them
are horribly scarred.
56
00:05:36,044 --> 00:05:39,381
But their wounds
were not inflicted by the ice.
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00:05:48,932 --> 00:05:52,686
A whale would be a huge prize
for any meat-eating hunter,
58
00:05:52,852 --> 00:05:55,522
and these belugas,
trapped by the ice,
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00:05:55,689 --> 00:05:57,816
are within reach of polar bears.
60
00:06:11,454 --> 00:06:13,498
Well aware of the danger,
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00:06:13,665 --> 00:06:17,127
the belugas stay submerged
as long as they can,
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00:06:17,293 --> 00:06:21,047
but they can only hold their breath
for about 20 minutes.
63
00:06:40,692 --> 00:06:44,529
Catching a four-metre-long whale
that weighs one tonne
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00:06:44,696 --> 00:06:46,281
is no easy task,
65
00:06:46,448 --> 00:06:50,285
even if that whale
is weakened by starvation.
66
00:07:02,005 --> 00:07:05,550
But a beluga
is well worth waiting for.
67
00:07:29,574 --> 00:07:31,868
Day by day,
as the hole gets bigger,
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00:07:32,035 --> 00:07:36,289
it becomes increasingly difficult
for the bear to land a whale.
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00:07:40,126 --> 00:07:43,588
Keeping its fur in good condition
and free from salt
70
00:07:43,755 --> 00:07:45,632
is important for warmth,
71
00:07:45,799 --> 00:07:48,885
and the bear uses snow
like blotting paper.
72
00:08:00,772 --> 00:08:03,775
These belugas have been attacked
by many bears
73
00:08:03,942 --> 00:08:05,610
over the last six months,
74
00:08:05,777 --> 00:08:07,862
and some have been caught.
75
00:08:11,157 --> 00:08:14,452
It may have taken a long time
and a lot of patience,
76
00:08:14,619 --> 00:08:18,415
but a catch when it's made
brings abundant rewards
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00:08:18,581 --> 00:08:20,375
of energy-rich blubber.
78
00:08:31,428 --> 00:08:35,098
Gulls rely on bear kills
at this time of the year,
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00:08:35,265 --> 00:08:37,892
and the colour of blood
staining the ice
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00:08:38,059 --> 00:08:40,395
attracts them from a long way away.
81
00:08:44,482 --> 00:08:47,444
The remaining belugas
still have a long wait
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00:08:47,610 --> 00:08:50,488
before they're released
from their prison
83
00:08:50,655 --> 00:08:52,615
and the threat of slaughter.
84
00:09:21,269 --> 00:09:24,105
Arctic foxes
also rely on the polar bears
85
00:09:24,272 --> 00:09:26,274
to hunt on their behalf.
86
00:09:26,441 --> 00:09:28,818
They're the jackals of the north,
87
00:09:28,985 --> 00:09:32,489
and scavenge from bear kills
whenever they can.
88
00:09:40,997 --> 00:09:43,083
In winter and early spring,
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00:09:43,249 --> 00:09:45,960
they're wholly dependent on bears.
90
00:09:46,127 --> 00:09:48,922
Only in the summer,
when the sea ice melts,
91
00:09:49,089 --> 00:09:52,300
will they regularly catch prey
for themselves.
92
00:09:59,599 --> 00:10:02,852
They're not strong enough
to tackle adult seals,
93
00:10:03,019 --> 00:10:06,690
but can certainly take
new-born pups or birds.
94
00:10:20,704 --> 00:10:22,414
This canny individual
95
00:10:22,580 --> 00:10:24,666
is going to bury its prize.
96
00:10:24,833 --> 00:10:28,044
It may need it
during the uncertain times ahead.
97
00:10:31,798 --> 00:10:33,550
The presence of bears
98
00:10:33,717 --> 00:10:38,304
affects the behaviour of almost all
the animals here, big and small.
99
00:10:38,471 --> 00:10:41,933
The bears tend to avoid
the fringe of fragmented ice
100
00:10:42,100 --> 00:10:43,893
bordering open water
101
00:10:44,060 --> 00:10:46,771
where travelling
can be very laborious,
102
00:10:46,938 --> 00:10:50,150
but that very fact
makes this area - the pack ice -
103
00:10:50,316 --> 00:10:52,277
a particularly good place
104
00:10:52,444 --> 00:10:54,362
for seals to pup.
105
00:11:03,079 --> 00:11:04,789
Harp seals breed here.
106
00:11:04,956 --> 00:11:07,375
Their pups are born with white coats
107
00:11:07,542 --> 00:11:11,463
which camouflage them
very effectively against the snow.
108
00:11:13,631 --> 00:11:16,593
Harp seals have
a very short nursing period -
109
00:11:16,760 --> 00:11:19,512
a necessity
on this unstable pack ice -
110
00:11:19,679 --> 00:11:22,557
but suckling is intensive.
111
00:11:22,724 --> 00:11:25,560
The pup feeds for just 12 days
112
00:11:25,727 --> 00:11:27,979
on milk that is 45 per cent fat.
113
00:11:28,146 --> 00:11:30,774
Then it's abandoned
114
00:11:30,940 --> 00:11:33,026
and has to fend for itself.
115
00:11:36,446 --> 00:11:37,989
A male hooded seal.
116
00:11:42,869 --> 00:11:44,954
This impressive nasal display
117
00:11:45,121 --> 00:11:48,208
is used to warn away other males...
118
00:11:54,881 --> 00:11:56,341
and to win a mate.
119
00:11:57,384 --> 00:11:59,803
Hooded seals also breed
on pack ice.
120
00:12:00,053 --> 00:12:02,555
Their pups suckle
for only four days,
121
00:12:02,722 --> 00:12:06,101
the shortest nursing period
known for any mammal,
122
00:12:06,267 --> 00:12:09,771
and all because
the threat of polar bears
123
00:12:09,938 --> 00:12:12,982
caused them to breed
on the unstable ice.
124
00:12:28,957 --> 00:12:33,420
Another Arctic seal opts
for the solid ice further north.
125
00:12:34,337 --> 00:12:37,048
Because it's easy for bears
to hunt here,
126
00:12:37,215 --> 00:12:40,593
these ringed seals
must be particularly vigilant
127
00:12:40,760 --> 00:12:42,846
and have to hide their pups.
128
00:12:46,850 --> 00:12:49,477
Ringed seals
are comparatively small,
129
00:12:49,644 --> 00:12:51,980
so they can give birth
to their pups
130
00:12:52,147 --> 00:12:54,774
in little caves or lairs
under the snow.
131
00:12:55,692 --> 00:12:57,527
Here, a pup is out of sight
132
00:12:57,694 --> 00:12:59,863
and protected from bad weather.
133
00:13:04,451 --> 00:13:06,536
In late March and into April,
134
00:13:06,703 --> 00:13:10,749
female bears emerge from
winter dens with their new cubs.
135
00:13:13,001 --> 00:13:16,212
The mother has not eaten
for at least five months
136
00:13:16,379 --> 00:13:18,590
and she's hungry - very hungry.
137
00:13:26,723 --> 00:13:30,685
If she doesn't succeed in catching
a regular supply of seals,
138
00:13:30,852 --> 00:13:32,312
her milk will fail
139
00:13:32,479 --> 00:13:34,272
and her cub will die.
140
00:13:40,695 --> 00:13:44,449
Bears have an extraordinarily
sensitive sense of smell
141
00:13:44,616 --> 00:13:47,535
and can detect seal pups
hidden in the snow
142
00:13:47,702 --> 00:13:49,662
from two kilometres away.
143
00:14:02,050 --> 00:14:05,428
But a female ringed seal
uses several lairs
144
00:14:05,595 --> 00:14:08,306
and a bear will have
to break into a number
145
00:14:08,473 --> 00:14:11,643
before it finds one
that is occupied.
146
00:14:21,236 --> 00:14:23,488
This is a crucial time for the cub.
147
00:14:23,655 --> 00:14:25,740
By watching its mother hunt
148
00:14:25,907 --> 00:14:30,495
and by copying her actions, it's
beginning to acquire the rudiments
149
00:14:30,662 --> 00:14:32,747
of its own hunting skills.
150
00:14:37,085 --> 00:14:40,213
Play is also important
for developing muscles
151
00:14:40,380 --> 00:14:42,382
and improving co-ordination.
152
00:15:02,736 --> 00:15:04,279
As the days go by,
153
00:15:04,446 --> 00:15:08,533
the sun rises higher and remains
above the horizon even at night.
154
00:15:17,876 --> 00:15:20,670
The female bear continues to hunt
155
00:15:20,837 --> 00:15:23,923
until her cub is too tired
and can't keep up.
156
00:15:29,804 --> 00:15:31,681
She's smelt something.
157
00:15:55,455 --> 00:15:58,583
The pup escapes
through a hole in its lair
158
00:15:58,750 --> 00:16:00,835
that leads to the sea below.
159
00:16:24,943 --> 00:16:27,904
Only one in 20 hunts is successful,
160
00:16:28,196 --> 00:16:30,824
but this mother
must find a seal pup soon
161
00:16:30,990 --> 00:16:33,618
if her cub is not
to starve to death.
162
00:16:51,219 --> 00:16:56,224
As spring turns into summer, the sun's
heat begins to melt the sea ice.
163
00:17:00,603 --> 00:17:02,564
Now, the ocean is accessible
164
00:17:02,731 --> 00:17:05,817
and the Arctic's summer visitors
return.
165
00:17:05,984 --> 00:17:07,485
Migrating birds
166
00:17:07,652 --> 00:17:09,237
arrive from the south
167
00:17:09,404 --> 00:17:13,116
to nest and feed on the seafood
now within their reach.
168
00:17:13,283 --> 00:17:14,909
Brunnich's guillemots
169
00:17:15,076 --> 00:17:17,871
are the northern equivalent
of penguins,
170
00:17:18,038 --> 00:17:20,832
but they have retained
the power of flight
171
00:17:20,999 --> 00:17:23,668
for they need to reach cliff ledges
172
00:17:23,835 --> 00:17:28,006
where their nests will be safe
from predatory bears and foxes.
173
00:17:45,106 --> 00:17:49,194
Nonetheless, they are as at home
in the water as in the air.
174
00:17:50,987 --> 00:17:53,907
They dive down
to a depth of 50 metres or more
175
00:17:54,074 --> 00:17:55,575
to catch fish.
176
00:18:05,126 --> 00:18:07,754
In June, the ice begins to fracture.
177
00:18:07,921 --> 00:18:10,006
The cracks - or leads -
178
00:18:10,173 --> 00:18:12,592
form useful corridors of open water
179
00:18:12,759 --> 00:18:14,844
for air-breathing animals.
180
00:18:19,057 --> 00:18:22,185
Belugas, migrating
to their feeding grounds,
181
00:18:22,352 --> 00:18:26,523
use these leads to penetrate
the ice-covered seas and reach areas
182
00:18:26,690 --> 00:18:30,860
where their preferred food,
Arctic cod, has spent the winter.
183
00:18:37,867 --> 00:18:42,789
The males regularly dive
to about 500 metres to find fish.
184
00:18:43,081 --> 00:18:46,668
The females and young,
which have smaller lungs,
185
00:18:46,835 --> 00:18:49,462
only go to about 350.
186
00:19:01,850 --> 00:19:05,603
In late June and July,
narwhals arrive.
187
00:19:07,272 --> 00:19:10,191
The females,
who usually lack tusks,
188
00:19:10,358 --> 00:19:12,610
come first with their new calves.
189
00:19:12,777 --> 00:19:14,904
The males follow a little later.
190
00:19:28,877 --> 00:19:31,171
They also move up the leads
191
00:19:31,338 --> 00:19:33,757
in search of fresh feeding grounds.
192
00:19:45,852 --> 00:19:48,271
Bowheads. Up to 18 metres long
193
00:19:48,438 --> 00:19:50,482
and weighing 100 tonnes.
194
00:19:51,399 --> 00:19:53,485
These are the only large whales
195
00:19:53,651 --> 00:19:56,196
that stay in the Arctic
all year round.
196
00:20:12,754 --> 00:20:14,547
They are not after fish.
197
00:20:14,714 --> 00:20:17,133
They're seeking smaller prey.
198
00:20:18,385 --> 00:20:22,222
Despite having the largest mouths
in the animal kingdom -
199
00:20:22,389 --> 00:20:24,474
the size of a small garage -
200
00:20:24,641 --> 00:20:27,185
they eat tiny crustaceans -
copepods -
201
00:20:27,727 --> 00:20:29,813
straining them from the water
202
00:20:29,979 --> 00:20:32,774
with the four-metre-long strips
of baleen
203
00:20:32,941 --> 00:20:35,110
that hang from their upper jaws.
204
00:20:43,702 --> 00:20:46,329
In the summer,
they store enough energy
205
00:20:46,496 --> 00:20:49,290
to last them
through the following winter
206
00:20:49,457 --> 00:20:51,626
when food will be less abundant.
207
00:20:54,129 --> 00:20:55,922
As the ice melts away,
208
00:20:56,089 --> 00:20:58,967
the polar bears are forced
to head for land.
209
00:21:01,511 --> 00:21:03,596
They are excellent swimmers,
210
00:21:03,763 --> 00:21:08,101
and can cover 100 miles
of continuous open water if need be.
211
00:21:45,430 --> 00:21:47,515
Off east Greenland,
212
00:21:47,682 --> 00:21:51,394
there is little ice left by August,
so walruses haul out
213
00:21:51,561 --> 00:21:53,355
to rest on land.
214
00:21:53,521 --> 00:21:56,024
At this time of year,
they are moulting,
215
00:21:56,191 --> 00:22:00,278
getting rid of their old,
scarred, parasite-ridden skin.
216
00:22:11,164 --> 00:22:15,293
A bathe in cold water brings
some relief from the itching...
217
00:22:34,270 --> 00:22:36,356
but even there,
218
00:22:36,523 --> 00:22:39,192
the odd scratch is irresistible.
219
00:22:58,753 --> 00:23:02,340
They make daily excursions
out to deeper water.
220
00:23:12,892 --> 00:23:14,477
Down at 20 metres,
221
00:23:14,644 --> 00:23:16,896
they root around in the sediment,
222
00:23:17,063 --> 00:23:19,232
using their sensitive bristles
223
00:23:19,399 --> 00:23:21,735
to search out soft-shelled clams.
224
00:23:41,504 --> 00:23:43,381
Once they find a clam,
225
00:23:43,548 --> 00:23:45,800
they suck its flesh from the shell
226
00:23:45,967 --> 00:23:48,595
with their powerful,
muscular mouths.
227
00:23:51,973 --> 00:23:55,477
Walruses can feed for
about five minutes at this depth
228
00:23:55,643 --> 00:23:59,189
before they have to return
to the surface to breathe.
229
00:24:06,821 --> 00:24:11,326
Elsewhere in the Arctic, belugas are
gathering in their thousands.
230
00:24:11,493 --> 00:24:15,205
They congregate
in just a few large estuaries.
231
00:24:17,999 --> 00:24:21,127
Belugas of all ages and sizes
come here.
232
00:24:21,628 --> 00:24:23,797
There are even young calves.
233
00:24:36,101 --> 00:24:37,686
Some are so young -
234
00:24:37,852 --> 00:24:39,938
born only a week or so ago -
235
00:24:40,105 --> 00:24:41,773
that they need help.
236
00:24:41,940 --> 00:24:44,192
They swim on their mothers' backs
237
00:24:44,359 --> 00:24:46,861
so that they can breathe
more easily.
238
00:24:57,997 --> 00:25:00,333
As the tide moves up the estuary,
239
00:25:00,500 --> 00:25:02,085
the belugas follow,
240
00:25:02,252 --> 00:25:05,213
swimming into surprisingly
shallow water.
241
00:25:12,679 --> 00:25:14,222
Like walruses,
242
00:25:14,389 --> 00:25:16,349
they also need to moult.
243
00:25:24,733 --> 00:25:27,068
A combination of warm fresh water
244
00:25:27,235 --> 00:25:31,197
and vigorous rubbing
against the gravel does the trick.
245
00:25:42,834 --> 00:25:44,711
They remain here for days
246
00:25:44,878 --> 00:25:46,421
or even weeks,
247
00:25:46,588 --> 00:25:49,090
so it's likely that socialising
248
00:25:49,257 --> 00:25:51,384
is also important to them.
249
00:25:57,474 --> 00:26:01,353
After moulting,
they head back out to sea to feed.
250
00:26:07,484 --> 00:26:09,069
It's now autumn,
251
00:26:09,235 --> 00:26:12,405
and the sea begins
to freeze over once again.
252
00:26:18,328 --> 00:26:20,914
Thin sheets of ice form
at the surface
253
00:26:21,081 --> 00:26:23,041
and pile up, layer upon layer,
254
00:26:23,208 --> 00:26:26,336
gradually creating
an impenetrable barrier.
255
00:26:35,011 --> 00:26:40,892
By late November, the Arctic ocean
is sealed once again by ice.
256
00:26:55,657 --> 00:26:57,784
The lights of the aurora
257
00:26:57,951 --> 00:26:59,994
play in the winter sky.
258
00:27:11,047 --> 00:27:14,509
And at the other end
of the planet - in the Antarctic -
259
00:27:14,676 --> 00:27:16,761
there is the southern aurora.
260
00:27:32,861 --> 00:27:35,572
Antarctica is now
emerging from winter.
261
00:27:36,489 --> 00:27:39,784
This is the coldest,
windiest place in the world.
262
00:27:39,951 --> 00:27:43,955
Temperatures are still hovering
at a numbing minus 50,
263
00:27:44,122 --> 00:27:47,250
and the returning sun
has virtually no warmth.
264
00:27:48,043 --> 00:27:52,297
Very few animals can survive
such extreme conditions...
265
00:27:53,840 --> 00:27:56,926
but Emperor penguins can.
266
00:27:57,093 --> 00:27:59,179
(HOWLING, ROARING WIND)
267
00:28:02,932 --> 00:28:05,018
Standing on the frozen sea,
268
00:28:05,185 --> 00:28:08,646
they endure the full force
of the Antarctic storms.
269
00:28:18,031 --> 00:28:20,158
Only by huddling together
270
00:28:20,325 --> 00:28:23,745
can they survive
the appalling winter months.
271
00:28:29,793 --> 00:28:34,047
They take it in turns
to bear the brunt of the gales.
272
00:28:36,049 --> 00:28:38,134
They can only live here at all
273
00:28:38,301 --> 00:28:42,472
because Antarctica is surrounded
by the great Southern Ocean
274
00:28:42,639 --> 00:28:45,684
and no land predators
have been able to reach it,
275
00:28:45,850 --> 00:28:47,936
so, unlike Arctic animals,
276
00:28:48,103 --> 00:28:50,814
they're not threatened
by polar bears.
277
00:28:54,317 --> 00:28:56,111
The sea is still frozen,
278
00:28:56,277 --> 00:28:59,656
but one seal, nonetheless,
manages to stay here,
279
00:28:59,864 --> 00:29:03,201
even throughout the winter -
280
00:29:06,413 --> 00:29:08,039
the Weddell seal.
281
00:29:23,096 --> 00:29:26,975
Underwater, it's protected
from the storms above,
282
00:29:27,142 --> 00:29:29,853
but it must have access
to the air all year
283
00:29:30,020 --> 00:29:31,980
in order to breathe.
284
00:29:43,324 --> 00:29:46,453
And they keep
their breathing holes open
285
00:29:46,619 --> 00:29:48,288
with their teeth.
286
00:29:58,965 --> 00:30:01,926
Only by continually
scraping away at the ice
287
00:30:02,093 --> 00:30:04,554
can they maintain access
to the air,
288
00:30:04,721 --> 00:30:08,183
but that means that their teeth
get badly worn down.
289
00:30:08,516 --> 00:30:12,062
Then, they can no longer hunt
and eat effectively.
290
00:30:12,228 --> 00:30:14,898
Weddell seals die young.
291
00:30:23,948 --> 00:30:26,326
The continent of Antarctica
292
00:30:26,493 --> 00:30:28,578
is so isolated and so high -
293
00:30:28,745 --> 00:30:31,331
almost 5,000 metres in places -
294
00:30:31,498 --> 00:30:34,709
that it's considerably colder
than the Arctic.
295
00:30:37,545 --> 00:30:41,007
Ice slides slowly down
from its centre
296
00:30:41,174 --> 00:30:43,677
towards its rim
in immense glaciers.
297
00:30:46,304 --> 00:30:50,392
During winter, the continent
effectively doubles in size
298
00:30:50,558 --> 00:30:52,227
as the sea freezes over.
299
00:30:52,394 --> 00:30:55,105
Ice forms around its shores
300
00:30:55,271 --> 00:30:58,149
and extends outwards
for hundreds of miles
301
00:30:58,316 --> 00:31:00,402
around the entire land mass.
302
00:31:06,282 --> 00:31:10,370
Under the sea ice live small
shrimp-like creatures - krill.
303
00:31:10,537 --> 00:31:13,623
They have been here all winter.
304
00:31:15,917 --> 00:31:18,211
During these dark months,
305
00:31:18,378 --> 00:31:21,423
they feed by scraping algae
from the ice.
306
00:31:24,259 --> 00:31:26,761
Remarkably, they also shrink in size
307
00:31:26,928 --> 00:31:30,223
and revert to their juvenile form
to save energy.
308
00:31:37,731 --> 00:31:40,400
As the temperature rises in spring,
309
00:31:40,567 --> 00:31:42,402
the ice begins to melt,
310
00:31:42,569 --> 00:31:46,114
and little air bubbles
trapped within it are released.
311
00:31:46,281 --> 00:31:49,200
Microscopic algae grow
around these bubbles
312
00:31:49,367 --> 00:31:51,453
and the krill now graze on them,
313
00:31:51,619 --> 00:31:54,581
gathering them up
with their beating legs.
314
00:32:11,639 --> 00:32:13,725
As the sun's rays grow stronger
315
00:32:13,892 --> 00:32:16,561
and penetrate deeper
into the water,
316
00:32:16,728 --> 00:32:19,147
floating algae begin to flourish,
317
00:32:20,231 --> 00:32:22,484
and krill leave the dwindling ice
318
00:32:22,901 --> 00:32:24,778
and gather in swarms
319
00:32:24,944 --> 00:32:27,030
as they harvest this new crop.
320
00:32:37,207 --> 00:32:38,750
Far to the north,
321
00:32:38,917 --> 00:32:41,002
beyond the blanket of sea ice,
322
00:32:41,169 --> 00:32:42,754
chinstrap penguins
323
00:32:42,921 --> 00:32:45,882
have been overwintering
in the open ocean.
324
00:32:53,348 --> 00:32:55,433
The occasional iceberg
325
00:32:55,600 --> 00:32:57,769
gives them the chance of a rest -
326
00:32:57,936 --> 00:33:00,021
if they can get onto it.
327
00:33:29,759 --> 00:33:33,138
But at this time of year,
where they really want to be
328
00:33:33,304 --> 00:33:34,764
is on land.
329
00:33:34,931 --> 00:33:38,518
It's just getting there
that's tricky.
330
00:33:56,911 --> 00:34:00,915
It's spring, and the penguins
are returning to breed.
331
00:34:07,881 --> 00:34:11,676
Their need to get ashore
is now urgent and imperative.
332
00:34:25,315 --> 00:34:27,984
Doing so is all a matter of timing,
333
00:34:28,151 --> 00:34:30,236
and picking the right wave.
334
00:35:19,244 --> 00:35:21,788
But their journey
has only just begun.
335
00:35:22,372 --> 00:35:25,000
Most of them will have to walk
many miles
336
00:35:25,166 --> 00:35:27,502
before they can find a nest site.
337
00:35:36,928 --> 00:35:39,431
(TREMENDOUS DIN)
338
00:35:43,143 --> 00:35:45,353
This is Zavodovski Island,
339
00:35:45,520 --> 00:35:48,898
which has the largest
penguin colony in the world.
340
00:35:50,233 --> 00:35:53,028
About two million chinstraps
breed here,
341
00:35:53,194 --> 00:35:56,448
and they come to THIS island
for a good reason.
342
00:36:02,245 --> 00:36:04,330
It's an active volcano.
343
00:36:04,497 --> 00:36:07,792
The heat from the crater
and the fumeroles
344
00:36:07,959 --> 00:36:10,837
keeps the slopes
free from the ice and snow,
345
00:36:11,004 --> 00:36:14,758
allowing these chinstraps
to start breeding earlier
346
00:36:14,924 --> 00:36:16,801
than those further south.
347
00:36:19,512 --> 00:36:21,056
But then again,
348
00:36:21,222 --> 00:36:25,101
living on an active volcano
is not without its risks.
349
00:36:26,978 --> 00:36:28,563
Unlike the Emperors,
350
00:36:28,730 --> 00:36:32,525
these penguins are able to lay
their eggs on the bare ground.
351
00:36:32,692 --> 00:36:36,654
Little wonder so many choose
to brave the mountainous waves
352
00:36:36,821 --> 00:36:38,365
in order to get here.
353
00:36:45,205 --> 00:36:47,624
Further south, near the continent,
354
00:36:47,791 --> 00:36:50,919
the blanket of sea ice
is beginning to break up.
355
00:36:55,840 --> 00:36:58,468
Icebergs are gigantic fragments
of ice
356
00:36:58,635 --> 00:37:02,722
that have broken away into the sea
from the front of glaciers.
357
00:37:02,889 --> 00:37:06,434
During the winter,
they were frozen into the sea ice,
358
00:37:06,601 --> 00:37:08,978
but now they're set adrift
once more.
359
00:37:48,560 --> 00:37:50,311
As the bergs break up,
360
00:37:50,478 --> 00:37:52,480
they form brash ice.
361
00:37:53,481 --> 00:37:57,193
It litters the backwaters
of the Antarctic peninsula.
362
00:38:17,297 --> 00:38:21,885
Minke whales make their way
into these placid waters in summer.
363
00:38:22,052 --> 00:38:25,805
This is the most abundant whale
in the Southern Ocean.
364
00:38:37,484 --> 00:38:41,529
Minkes are one of the smallest
of all the baleen whales,
365
00:38:41,696 --> 00:38:44,741
and like all others,
they come here to feed.
366
00:38:58,171 --> 00:39:00,256
The majestic humpback whales
367
00:39:00,423 --> 00:39:02,300
are also summer visitors.
368
00:39:11,351 --> 00:39:13,895
They have travelled
thousands of miles
369
00:39:14,062 --> 00:39:17,440
from their winter breeding grounds
in the tropics
370
00:39:17,607 --> 00:39:21,444
to gather the food that becomes
available here in summer.
371
00:39:37,252 --> 00:39:38,920
In just four months,
372
00:39:39,087 --> 00:39:41,172
they accumulate enough fat
373
00:39:41,339 --> 00:39:45,468
to provide them with energy for
the whole of the rest of the year.
374
00:40:03,737 --> 00:40:07,449
All these animals have come here
in search of one thing -
375
00:40:07,615 --> 00:40:09,159
the krill.
376
00:40:10,368 --> 00:40:12,454
Krill is the mainstay
377
00:40:12,620 --> 00:40:14,706
of the Antarctic food web.
378
00:40:22,964 --> 00:40:25,258
It occurs in phenomenal quantity -
379
00:40:25,425 --> 00:40:28,386
billions of individuals
in a single swarm,
380
00:40:28,928 --> 00:40:31,264
and swarms can stretch for miles.
381
00:40:36,561 --> 00:40:40,982
Fur seals also collect
this rich, super-abundant food.
382
00:40:42,025 --> 00:40:44,110
Krill swarms are very patchy,
383
00:40:44,277 --> 00:40:45,820
but once found,
384
00:40:45,987 --> 00:40:47,530
feeding is easy.
385
00:41:14,933 --> 00:41:19,020
Humpbacks engulf
hundreds of thousands of them
386
00:41:19,187 --> 00:41:21,773
in a single gargantuan mouthful.
387
00:41:33,743 --> 00:41:35,286
When the going is good,
388
00:41:35,453 --> 00:41:37,414
the whales feed continuously,
389
00:41:37,580 --> 00:41:40,083
each eating
up to two tonnes of krill
390
00:41:40,250 --> 00:41:41,876
in 24 hours.
391
00:41:46,214 --> 00:41:49,884
Further south, near the continent,
the sea ice is still sound.
392
00:41:50,051 --> 00:41:53,430
Here, where the ice remains
for most of the summer,
393
00:41:53,596 --> 00:41:55,932
Emperor penguins make their home.
394
00:41:57,100 --> 00:41:59,686
These have been feeding out at sea,
395
00:41:59,853 --> 00:42:03,314
and are now ready to make
their way back to the colony
396
00:42:03,481 --> 00:42:05,191
to feed their chicks.
397
00:42:07,444 --> 00:42:11,114
Instead of heading
straight for the ice edge,
398
00:42:11,281 --> 00:42:14,325
the penguins hesitate
some distance from it.
399
00:42:15,201 --> 00:42:16,745
They're nervous.
400
00:42:29,299 --> 00:42:30,884
They dive down
401
00:42:31,051 --> 00:42:33,678
and investigate the ice edge...
402
00:42:48,818 --> 00:42:50,570
And for good reason.
403
00:42:50,737 --> 00:42:53,740
Leopard seals patrol this border.
404
00:43:02,165 --> 00:43:06,795
Leopard seals are the Antarctic's
equivalent of polar bears.
405
00:43:06,961 --> 00:43:08,838
They're the top predators,
406
00:43:09,005 --> 00:43:12,050
but they hunt most successfully
in the water,
407
00:43:12,217 --> 00:43:13,802
so by and large,
408
00:43:13,968 --> 00:43:17,180
the animals they prey on
are safer out on the ice.
409
00:43:24,270 --> 00:43:28,983
They have a lazy grace
that belies their ferocious nature.
410
00:43:43,748 --> 00:43:46,084
Confident that the coast is clear,
411
00:43:46,251 --> 00:43:48,962
the Emperor penguins
head for the ice...
412
00:43:51,047 --> 00:43:53,299
but they certainly don't linger.
413
00:44:35,258 --> 00:44:39,471
Now they have a long walk back
to the colony.
414
00:44:44,559 --> 00:44:48,646
Emperor penguin colonies are
some way back from the ice edge.
415
00:44:49,522 --> 00:44:53,151
In winter, they may be
as much as 100 miles from it,
416
00:44:53,318 --> 00:44:56,446
but as the summer progresses
and the ice melts,
417
00:44:56,613 --> 00:44:59,324
the edge comes ever closer
to the colony.
418
00:44:59,491 --> 00:45:02,077
So by the time the chicks
are fledged
419
00:45:02,243 --> 00:45:04,579
and ready to take their first swim,
420
00:45:04,746 --> 00:45:06,289
the water is close by.
421
00:45:14,631 --> 00:45:17,717
This colony is in the lee
of a headland,
422
00:45:17,884 --> 00:45:20,929
and that prevents the ice
from being broken up
423
00:45:21,096 --> 00:45:22,722
by ocean currents.
424
00:45:23,223 --> 00:45:25,892
The returning adults
are so full of food
425
00:45:26,059 --> 00:45:27,852
that they can barely walk,
426
00:45:28,019 --> 00:45:30,855
but with no predator
to threaten them now,
427
00:45:31,022 --> 00:45:33,108
they can take their time.
428
00:45:42,409 --> 00:45:46,454
Somehow, in this mêlée
of 60,000 or so penguins,
429
00:45:46,621 --> 00:45:48,915
a parent has to find its chick.
430
00:45:59,342 --> 00:46:02,762
It returns to the place
where it last left its chick
431
00:46:02,929 --> 00:46:05,932
in the hope
that it might still be close by...
432
00:46:08,476 --> 00:46:11,104
but chicks tend to wander,
433
00:46:11,271 --> 00:46:13,815
so the adult has to call to it.
434
00:46:16,401 --> 00:46:19,029
(ADULT MAKES LOW TRILLING CALL)
435
00:46:22,323 --> 00:46:24,576
(CHICK MAKES HIGH-PITCHED PEEP)
436
00:46:28,705 --> 00:46:30,290
The chick responds,
437
00:46:30,457 --> 00:46:32,876
and they slowly
home in on one another.
438
00:46:33,043 --> 00:46:35,545
The plaintive entreaties
of the chick
439
00:46:35,712 --> 00:46:39,549
stimulates the adult
to regurgitate a mouthful of fish.
440
00:46:50,560 --> 00:46:52,645
With the return of one parent,
441
00:46:52,812 --> 00:46:55,857
the other is free to go to sea
to feed for itself.
442
00:47:11,706 --> 00:47:14,209
Aware of the leopard seal's
presence,
443
00:47:14,376 --> 00:47:17,587
the penguins press together
at the ice edge
444
00:47:17,754 --> 00:47:21,007
unwilling to be the first
to risk diving in.
445
00:47:37,315 --> 00:47:40,485
Occasionally,
the seal comes out onto the ice
446
00:47:40,652 --> 00:47:42,737
and attempts to grab one...
447
00:47:58,169 --> 00:48:01,381
But its most successful strategy
by far
448
00:48:01,548 --> 00:48:03,091
is to lie in wait.
449
00:48:10,890 --> 00:48:13,435
It hides behind a corner of ice.
450
00:48:16,521 --> 00:48:18,606
The Emperors gain confidence
451
00:48:18,773 --> 00:48:20,358
and make a dash for it.
452
00:48:32,662 --> 00:48:35,373
The first wave of penguins escape.
453
00:48:38,209 --> 00:48:40,712
Once in open water,
they will be safe.
454
00:48:45,884 --> 00:48:48,219
But the seal is alerted
by the noise,
455
00:48:48,386 --> 00:48:51,765
and through the mass of bubbles,
it makes its attack.
456
00:49:02,817 --> 00:49:05,779
Almost invariably, it makes a kill.
457
00:49:13,411 --> 00:49:15,955
Encouraged by the absence
of the seal,
458
00:49:16,122 --> 00:49:19,751
the remaining penguins
make a break for the open sea.
459
00:49:39,979 --> 00:49:42,357
In time, their chicks will fledge,
460
00:49:42,524 --> 00:49:45,568
and when the Antarctic autumn
is near its end,
461
00:49:45,735 --> 00:49:49,114
these adults will walk
across the newly-formed ice
462
00:49:49,280 --> 00:49:51,366
to endure yet another winter
463
00:49:51,533 --> 00:49:53,868
on the frozen sea.
464
00:49:55,704 --> 00:49:59,874
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