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(THUNDER CRACKS)
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00:00:16,723 --> 00:00:20,443
TOM HARDY:
Predators across the planet,
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00:00:20,443 --> 00:00:22,683
unmatched in strength...
(ROARING)
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00:00:22,683 --> 00:00:24,843
...speed,
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00:00:24,843 --> 00:00:26,523
strategy,
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00:00:26,523 --> 00:00:29,603
stealth, and teamwork.
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00:00:30,523 --> 00:00:33,363
But staying on top is never easy.
(LION GROWLS)
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00:00:36,443 --> 00:00:38,803
(LION CUB GROWLS) As the world
around them changes,
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00:00:38,803 --> 00:00:41,643
they must adapt
faster than ever before
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00:00:41,643 --> 00:00:44,483
to maintain their rule.
(LION GROWLS)
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00:00:44,483 --> 00:00:46,603
(SNARLS)
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00:00:48,163 --> 00:00:50,723
(ANIMALS GROWLING AND GRUNTING)
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00:00:50,723 --> 00:00:56,363
In sub-Arctic Canada,
the largest bears on earth...
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00:00:56,363 --> 00:00:58,723
(GRUNTS)
...dominate.
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00:00:58,723 --> 00:01:00,883
(ROARING)
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00:01:00,883 --> 00:01:04,923
From the smallest cub
to the biggest males,
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00:01:04,923 --> 00:01:09,883
they face one common enemy. Hunger.
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00:01:09,883 --> 00:01:13,643
Every year,
the polar bears of Hudson Bay
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travel hundreds of kilometres
across the frozen sea to hunt seals.
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00:01:18,203 --> 00:01:20,483
(CALLS SOFTLY)
But time is against them.
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00:01:21,403 --> 00:01:25,643
As summer approaches,
the sea ice melts away...
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...forcing them back to land,
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00:01:29,843 --> 00:01:34,163
where they must master a new world
until winter returns,
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or face an uncertain future.
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00:01:51,083 --> 00:01:55,203
The end of autumn on the western
shore of Canada's Hudson Bay.
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00:01:59,043 --> 00:02:02,883
Home to a bustling community
of 1,000 polar bears.
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00:02:05,163 --> 00:02:07,163
Made up of mums and cubs,
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00:02:08,203 --> 00:02:13,523
boisterous teenagers,
and solitary adults.
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00:02:13,523 --> 00:02:18,123
With its rugged shoreline,
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00:02:18,123 --> 00:02:22,803
and vast waters,
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00:02:22,803 --> 00:02:25,963
Hudson Bay is
an extreme place to live.
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(WIND HOWLING)
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Temperatures here on land
are beginning to drop.
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And the entire bay starts to freeze.
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00:02:47,323 --> 00:02:49,723
Nanuk, a young hungry bear,
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is being forced to live on land...
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...where food is scarce.
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But five months of famine
has weakened him.
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00:03:02,763 --> 00:03:07,323
He is losing roughly
a kilo of body mass a day.
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00:03:11,243 --> 00:03:14,083
While he's desperate
to move out onto the ice,
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00:03:14,083 --> 00:03:17,163
it's not yet solid enough
to hold his weight.
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As the bay begins to freeze over,
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the atmosphere is tense
as more bears begin to gather.
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Pukak, a rival bear,
begins to size up Nanuk.
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(BIRD TRILLING)
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(WIND HOWLING)
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They are both famished.
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(GROWLING)
Nanuk must stand his ground.
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At almost 400 kilograms,
both bears are heavyweights.
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Nanuk steps into the ring
and strikes a mighty blow.
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00:04:04,443 --> 00:04:06,483
(ROARING)
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(BOTH ROARING)
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It may look brutal...
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(ROARS)
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...but the aim
is not to inflict injury.
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Nanuk's goal is to pin
his opponent to the ground.
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Determined, he gains the upper hand,
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throwing all his weight
upon his rival.
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(ROARING)
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00:05:01,043 --> 00:05:03,563
Pukak is overpowered.
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(WHIMPERING)
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Nanuk has won.
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00:05:12,203 --> 00:05:15,523
Play-fights like this cement Nanuk's
place amongst the other males
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and gain him
essential fighting skills.
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(GROWLS)
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Having asserted his dominance,
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he now needs to conserve energy
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while he waits
for the bay to freeze.
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Hudson Bay is undergoing
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one of the most dramatic
seasonal changes on Earth.
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With the sea freezing solid,
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forming ice three times the size
of the United Kingdom.
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But it's not only bears that
call this frozen desert home.
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They share it with the seals
that raise their young here.
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00:05:49,843 --> 00:05:53,803
The prey of choice
for this predator.
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00:06:02,003 --> 00:06:05,883
Nanuk is not alone
hunting on the sea ice.
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00:06:05,883 --> 00:06:10,043
Polar bears of every generation
are on the move.
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00:06:10,043 --> 00:06:13,923
From seasoned veterans...
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00:06:13,923 --> 00:06:15,963
...to first-timers.
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00:06:17,923 --> 00:06:21,363
And after weeks on the ice,
this young male bear
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is still getting to grips
with locating seals.
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This could take some time.
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00:06:29,123 --> 00:06:32,843
His prey number in their thousands,
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and they can only be reached through
cracks and holes in the sea ice.
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Lying in ambush
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can be a long and fruitless wait.
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(GRUNTS)
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It's better to keep on moving,
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00:06:51,723 --> 00:06:56,363
using his acute sense of smell
to track down his next meal.
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(GRUNTING)
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00:07:08,803 --> 00:07:11,763
His compulsion to hunt
drives him to search
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00:07:11,763 --> 00:07:15,523
for any signs of seals
above and below the ice.
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But swimming is hard work,
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00:07:20,283 --> 00:07:24,163
sapping his already
depleted energy levels.
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Finally,
a seal within his sights.
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But this bulky bear makes
for a less than ideal sprinter.
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Hunting relies
on the element of surprise.
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00:07:58,123 --> 00:08:00,003
(BIRDS SQUAWKING)
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00:08:00,003 --> 00:08:03,083
But bad timing.
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A flock of birds
draws the seal's gaze to him.
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00:08:07,083 --> 00:08:09,923
(WATER SPLASHES)
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00:08:09,923 --> 00:08:14,003
While he spends most of his life
in the pursuit of this prey,
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most hunts are unsuccessful.
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(ICE CRACKING)
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His quest continues.
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Until he finally picks up
on the scent he's been craving.
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Despite being almost invisible
from the surface,
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he has located a seal den
under the ice.
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(THUDDING)
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He pounds at the den roof,
desperate for what's below.
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(ICE CRACKS)
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Success.
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At last, he can feast.
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It's a promising start for
the first bears out on the ice.
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00:09:16,323 --> 00:09:21,403
If they are to pile on enough weight
to survive when the bay is ice-free,
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they need to work fast
and catch many more seals.
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But in recent years,
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00:09:28,323 --> 00:09:30,963
a warming climate
has altered their world,
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reducing the length of time
they can hunt on the ice.
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Five hundred kilometres west,
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00:09:46,283 --> 00:09:50,083
back on land, it's now March.
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Whilst most of the Hudson Bay bears
have been hunting on the sea ice,
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a small group of pregnant females
have remained inland.
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(WIND HOWLING)
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This single mum has carefully
dug out a den
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00:10:05,963 --> 00:10:09,083
for herself and her two cubs.
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00:10:13,483 --> 00:10:17,483
Her encounter with a male last year
resulted in the birth of her twins.
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(SCREECHING SOFTLY)
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Tala is the smaller cub
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and bears the brunt of big brother
Sika's playful scuffle.
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(WHIMPERS SOFTLY)
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He takes a bite,
letting Tala know who's boss.
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00:10:42,403 --> 00:10:44,403
(WIND HOWLING)
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Both baby bears are totally reliant
on their mother for milk and warmth.
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00:10:52,923 --> 00:10:56,123
Her cubs must feed
on her fat-rich milk
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every three to four hours
if they are to survive.
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00:11:06,523 --> 00:11:09,843
She has not eaten since she entered
the den eight months ago.
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00:11:17,003 --> 00:11:19,003
And there is no food for her here.
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00:11:23,883 --> 00:11:26,403
Soon, she will have to take
the cubs and leave.
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00:11:27,723 --> 00:11:31,563
But judging when to go
is a huge decision.
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00:11:31,563 --> 00:11:34,563
If she leads them
on this journey too soon,
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00:11:34,563 --> 00:11:37,723
they may not be strong enough
to survive.
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00:11:37,723 --> 00:11:40,883
If she leaves it too late,
they will starve.
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And with a storm building,
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the bears will be going nowhere today.
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(WIND HOWLING)
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00:12:05,923 --> 00:12:07,923
(BIRD CALLING)
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TOM HARDY: As the skies clear,
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00:12:11,603 --> 00:12:16,003
the Northern Lights dance above the
polar bear family as they sleep.
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00:12:16,003 --> 00:12:18,163
(WHISTLING)
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00:12:19,923 --> 00:12:22,323
(WHOOSHING)
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00:12:37,003 --> 00:12:40,403
Thankfully, the next day
is perfectly calm.
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Mum seizes the opportunity
to start their journey.
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00:12:55,523 --> 00:12:58,563
While big brother Sika runs ahead,
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00:12:58,563 --> 00:13:01,963
Tala's small frame
is holding him back.
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00:13:01,963 --> 00:13:04,603
(GRUNTS)
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00:13:10,323 --> 00:13:12,323
(WHIMPERS)
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00:13:17,563 --> 00:13:20,723
Mum offers him
some gentle encouragement.
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00:13:29,843 --> 00:13:32,883
After a few days
of non-stop walking,
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00:13:32,883 --> 00:13:35,443
Tala is exhausted.
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Driven by hunger, they all push on.
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But they still have
a gruelling 80 kilometres
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before the start of the shoreline.
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From there, almost a million
square kilometres of ice
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00:13:49,803 --> 00:13:51,923
lies ahead of them.
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00:13:51,923 --> 00:13:55,403
If they can make
this arduous journey,
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they will have the chance
to feed on seals.
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00:14:00,843 --> 00:14:03,803
(CUB CALLS SOFTLY)
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00:14:05,763 --> 00:14:10,883
After five days,
Tala is pushed to his limits.
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00:14:10,883 --> 00:14:14,563
He and his brother
are constantly demanding food,
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00:14:14,563 --> 00:14:18,123
and it's slowing their progress.
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00:14:29,483 --> 00:14:33,083
All tired little Tala
wants to do is feed and rest.
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00:14:35,283 --> 00:14:39,283
But after only a few minutes,
he is moved on.
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Sika bounds ahead
whilst Tala tries to keep up.
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00:15:04,123 --> 00:15:06,763
Incredibly, after eight days,
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they reach the coast,
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As the whole landscape
is covered by a blanket of snow,
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it is difficult to see
where the frozen land finishes
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and the sea ice begins.
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00:15:23,123 --> 00:15:25,563
(WIND HOWLING)
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00:15:29,243 --> 00:15:31,403
Around the Hudson Bay,
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00:15:31,403 --> 00:15:34,963
other polar bear mums
and new cubs are emerging,
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00:15:34,963 --> 00:15:38,843
some with even
more mouths to feed.
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All are bound for the sea ice.
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(SNIFFING)
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(WIND HOWLING)
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This mother expertly navigates
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00:15:58,403 --> 00:16:02,123
the ever-shifting landscape of ice
as it breaks up,
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00:16:02,123 --> 00:16:06,003
moves, and refreezes.
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00:16:08,603 --> 00:16:11,363
But negotiating it
with two small cubs
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00:16:11,363 --> 00:16:14,083
is a different challenge.
192
00:16:15,403 --> 00:16:19,643
Despite her best efforts,
they are easily distracted.
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00:16:27,603 --> 00:16:31,443
And these shallow meltwaters
are the perfect playground.
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00:16:37,483 --> 00:16:39,483
(GROWLING)
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00:16:44,003 --> 00:16:46,003
Even at this early age,
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00:16:46,003 --> 00:16:49,403
these cubs are developing
their fighting skills.
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00:16:53,843 --> 00:16:55,843
While the cubs play,
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00:16:55,843 --> 00:16:59,723
their resourceful mum searches
for a snack to tide them over.
199
00:17:03,603 --> 00:17:07,083
Beneath the surface, she finds them
mineral-rich sea kelp.
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00:17:12,643 --> 00:17:15,763
It's enough to distract them
from their game.
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00:17:15,763 --> 00:17:18,203
(SQUAWKING)
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00:17:22,203 --> 00:17:24,923
After her dip, a roll in the snow
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00:17:24,923 --> 00:17:28,723
is an opportunity to teach
the cubs how to dry off.
204
00:17:31,763 --> 00:17:35,043
(CUB SQUEALS) But she can't
afford for them to hang around.
205
00:17:37,723 --> 00:17:39,723
As the weeks pass,
206
00:17:39,723 --> 00:17:43,803
she experiences the thaw
sooner than expected.
207
00:17:43,803 --> 00:17:46,963
It's an early spring melt.
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00:17:49,403 --> 00:17:52,683
This is potentially devastating
for her cubs.
209
00:17:55,323 --> 00:17:58,323
The less time she has
to catch seals,
210
00:17:58,323 --> 00:18:02,123
the less likely her cubs
will survive their first year.
211
00:18:04,723 --> 00:18:07,203
If climate change continues
at its current rate...
212
00:18:07,203 --> 00:18:09,283
(ICE CRACKING)
213
00:18:09,283 --> 00:18:13,323
...the situation will only
get worse for this family.
214
00:18:20,803 --> 00:18:24,923
Traversing this icy landscape
has turned dangerous.
215
00:18:24,923 --> 00:18:27,723
(GRUNTING)
216
00:18:29,763 --> 00:18:33,283
They can no longer trust
the ground beneath their feet.
217
00:18:33,283 --> 00:18:36,363
(ICE CRACKING)
218
00:18:49,443 --> 00:18:53,843
Wading through icy water
is now a necessity.
219
00:18:55,683 --> 00:18:59,083
It's a life-or-death challenge
for the tiny cubs.
220
00:19:00,923 --> 00:19:03,083
(CUB WHIMPERS)
221
00:19:07,923 --> 00:19:10,323
(CUB WHIMPERS)
222
00:19:19,923 --> 00:19:24,363
But what they are about to face
is on an entirely different level.
223
00:19:26,003 --> 00:19:28,123
(SQUAWKING)
224
00:19:28,123 --> 00:19:30,323
Within weeks,
225
00:19:30,323 --> 00:19:33,563
the sea ice between the bears
and the land breaks up,
226
00:19:33,563 --> 00:19:38,123
creating millions
of shrinking islands.
227
00:19:38,123 --> 00:19:42,963
The family are now almost
300 kilometres from land,
228
00:19:42,963 --> 00:19:46,683
in the centre of the bay,
on the remaining ice.
229
00:19:46,683 --> 00:19:51,283
They must time this perfectly.
230
00:19:51,283 --> 00:19:54,043
If they depart too soon,
231
00:19:54,043 --> 00:19:57,843
they will not have eaten enough
seal blubber to last the year.
232
00:19:57,843 --> 00:19:59,883
If they leave it too late,
233
00:19:59,883 --> 00:20:03,563
the cubs will not survive
the long swim back to shore.
234
00:20:08,643 --> 00:20:11,923
It's just as well
that Mum has found her stride...
235
00:20:14,683 --> 00:20:18,163
...providing the cubs
with food on the move.
236
00:20:18,163 --> 00:20:21,603
From nutritious kelp
to nourishing seals.
237
00:20:24,323 --> 00:20:26,563
(ROARS)
238
00:20:26,563 --> 00:20:29,443
As they pile on the kilos,
239
00:20:29,443 --> 00:20:31,523
with each day that passes,
240
00:20:31,523 --> 00:20:34,603
the swim back to shore
grows longer.
241
00:20:37,443 --> 00:20:39,563
But despite her best efforts,
242
00:20:39,563 --> 00:20:42,523
Mum has run out of time.
243
00:20:46,163 --> 00:20:48,803
As the seals return
to an ice-free ocean,
244
00:20:48,803 --> 00:20:51,203
the Hudson Bay bears have no choice
245
00:20:51,203 --> 00:20:54,323
but to commence
their own journey back to land.
246
00:20:58,523 --> 00:21:02,363
One lone polar bear
is ahead of the family.
247
00:21:06,203 --> 00:21:09,083
He's had a successful season
248
00:21:09,083 --> 00:21:11,843
and is the heaviest
he will be this year.
249
00:21:11,843 --> 00:21:15,283
The ice beneath his feet thins
250
00:21:15,283 --> 00:21:18,963
and is already beginning
to give way beneath his weight.
251
00:21:20,403 --> 00:21:22,683
(SQUAWKING)
252
00:21:24,883 --> 00:21:27,043
Arriving at the frozen edge,
253
00:21:27,043 --> 00:21:30,603
he is confronted
with nothing but open water.
254
00:21:34,763 --> 00:21:37,403
But he has no idea
of the exact distance
255
00:21:37,403 --> 00:21:39,963
between him and the land.
256
00:21:48,083 --> 00:21:50,083
Over the next month,
257
00:21:50,083 --> 00:21:53,483
all the polar bears of Hudson Bay
begin their journey.
258
00:21:53,483 --> 00:21:56,443
Some over the remaining ice,
259
00:21:56,443 --> 00:22:00,643
others endure an exhausting swim.
260
00:22:02,843 --> 00:22:05,403
They will either reach the land
261
00:22:05,403 --> 00:22:08,323
or die trying.
262
00:22:20,363 --> 00:22:22,363
TOM HARDY: It's July,
263
00:22:22,363 --> 00:22:24,803
and five months
before the ice returns.
264
00:22:26,643 --> 00:22:30,763
Many of the Hudson Bay polar bears
have made it safely back to shore.
265
00:22:32,803 --> 00:22:35,683
These are the lucky ones.
266
00:22:35,683 --> 00:22:39,203
Some did not survive the swim.
267
00:22:39,203 --> 00:22:44,083
For those that did,
the landscape is transforming.
268
00:22:47,683 --> 00:22:50,763
As the last of the ice melts,
269
00:22:50,763 --> 00:22:53,523
temperatures are rising.
270
00:22:59,763 --> 00:23:03,843
Everything awakes
from its winter slumber.
271
00:23:07,363 --> 00:23:09,883
Summer has arrived.
272
00:23:12,923 --> 00:23:15,123
(BIRDS CHIRPING)
273
00:23:15,123 --> 00:23:17,883
Many creatures emerge
from hibernation
274
00:23:17,883 --> 00:23:21,443
or migrate thousands
of kilometres to feed here.
275
00:23:21,443 --> 00:23:24,323
(SQUAWKING)
276
00:23:24,323 --> 00:23:27,203
Now is a time of plenty for some,
277
00:23:27,203 --> 00:23:29,963
with food in abundance
up and down the coast.
278
00:23:35,683 --> 00:23:39,003
But while these animals
have everything they need,
279
00:23:39,003 --> 00:23:43,483
this family face a time of hardship.
280
00:23:49,723 --> 00:23:52,083
With the seals
far out of reach in the ocean,
281
00:23:52,083 --> 00:23:55,443
the bears' fat reserves
are their lifeline.
282
00:24:00,323 --> 00:24:03,523
The mother continues
to hunt for her family...
283
00:24:03,523 --> 00:24:05,363
(BEAR ROARS)
284
00:24:05,363 --> 00:24:09,363
...but most animals here on land
are too quick for her to catch.
285
00:24:09,363 --> 00:24:12,363
And so are just
not worth the energy.
286
00:24:15,843 --> 00:24:18,003
(BIRDS SQUAWKING)
287
00:24:18,003 --> 00:24:20,043
(MOTHER BEAR HUFFING)
288
00:24:22,883 --> 00:24:25,843
It is time for this apex predator
289
00:24:25,843 --> 00:24:29,323
to transform from hunter
to gatherer.
290
00:24:36,923 --> 00:24:39,123
Lush grasses offer a welcome snack.
291
00:24:44,963 --> 00:24:48,323
But a plant-based diet
can only do so much.
292
00:24:48,323 --> 00:24:50,443
Weight loss is inevitable.
293
00:24:58,563 --> 00:25:01,083
(BEES BUZZING)
294
00:25:01,083 --> 00:25:04,843
It's August now, and four months
before the big freeze.
295
00:25:16,923 --> 00:25:19,003
This young male, Arktos,
296
00:25:19,003 --> 00:25:21,923
is one month into his new diet.
297
00:25:25,763 --> 00:25:28,443
He is losing weight, and fast.
298
00:25:29,483 --> 00:25:32,123
(DISTANT HIGH-PITCHED CALLING)
299
00:25:34,123 --> 00:25:36,683
As he scours the landscape for food,
300
00:25:36,683 --> 00:25:40,003
a unique call entices him
up the shore.
301
00:25:44,243 --> 00:25:47,723
He hones in on its source
as it might provide a lifeline.
302
00:25:47,723 --> 00:25:49,763
(HIGH-PITCHED CALLING)
303
00:25:50,883 --> 00:25:53,403
Unbeknown to him, under the waves,
304
00:25:53,403 --> 00:25:59,043
thousands of beluga whales
have travelled here to give birth.
305
00:25:59,043 --> 00:26:01,363
(WHALES CALLING)
306
00:26:06,843 --> 00:26:09,603
This is a fleeting visit
of just weeks.
307
00:26:14,043 --> 00:26:16,443
Arktos has to figure out
how to catch one.
308
00:26:22,163 --> 00:26:26,083
Groups of whales pass him by,
far away from the shore.
309
00:26:26,083 --> 00:26:30,643
His only option is to plunge
into their world.
310
00:26:34,803 --> 00:26:37,763
But the tide is strong,
311
00:26:37,763 --> 00:26:41,323
and his prey swims out of reach.
312
00:26:52,843 --> 00:26:55,923
Time to rethink his tactics.
313
00:27:02,083 --> 00:27:05,443
He needs a vantage point if he wants
to surprise them from above.
314
00:27:08,483 --> 00:27:11,603
But this prime spot
from which to hunt is prized.
315
00:27:11,603 --> 00:27:16,523
And an older,
more experienced male, Ursa,
316
00:27:16,523 --> 00:27:19,683
wants the rock for himself.
317
00:27:27,883 --> 00:27:29,963
(ROARING)
318
00:27:29,963 --> 00:27:33,043
Contesting this is no play-fight.
319
00:27:35,083 --> 00:27:37,403
(ROARING)
320
00:27:44,083 --> 00:27:47,443
Out of his depth, he is defeated.
321
00:27:47,443 --> 00:27:50,643
And Arktos has no choice
but to head back to shore.
322
00:27:53,763 --> 00:27:57,363
But perhaps he can turn
this setback to his advantage,
323
00:27:57,363 --> 00:28:01,043
and Ursa can show him
how it's done.
324
00:28:04,083 --> 00:28:07,883
Silent and patient, Ursa waits.
325
00:28:10,803 --> 00:28:13,083
Timing is everything.
326
00:28:15,723 --> 00:28:19,123
Each passing whale
presents just one chance.
327
00:28:23,603 --> 00:28:25,883
Belugas drift close to his rock,
328
00:28:25,883 --> 00:28:28,443
unaware of the danger he presents.
329
00:28:33,123 --> 00:28:35,523
Ursa prepares to pounce.
330
00:28:35,523 --> 00:28:38,523
He must be deadly accurate.
23562
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