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Extraordinary Bear Moments | BBC Earth - Video học tiếng Anh
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Extraordinary Bear Moments | BBC Earth
Extraordinary Bear Moments | BBC Earth
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ترجمة (245)
0:00
Exhausted from his swim, the bear must
0:03
regain his strength.
0:12
The next day, a sea fog shrouds the
0:14
island. The Wallacees sense that they're
0:17
in danger.
0:22
Using the fog as cover, the bear
0:24
approaches the herd.
0:31
The adults close ranks around their
0:33
young, presenting a wall of blubber and
0:36
hide.
0:44
He tests the barrier,
0:47
but it stands firm.
0:50
It appears that the world's largest land
0:53
carnivore has met his match.
1:03
There must be a in the armor
1:05
somewhere.
1:10
Not here.
1:19
This female walrus is shielding her pup
1:22
if he can just prize her off.
1:32
The bear's claws and teeth can't
1:34
penetrate her thick hide.
1:45
With the herd retreating to water, the
1:47
bear must move quickly.
1:54
Having failed with one, he heads
1:56
straight for another.
2:15
The chance of his first meal in months
2:17
is slipping away.
2:26
He seems increasingly desperate.
2:34
It's now or never.
2:37
He must avoid the stabbing tusks if he's
2:40
to win.
2:48
The flailing walrus is immensely
2:50
powerful and drags the bear away from
2:52
the shallows towards the safety of the
2:55
herd.
3:11
It slips from his grasp.
3:17
At this time of year, polar bears on
3:19
average succeed only once in 20 hunts.
3:28
If the hunter is skinny like this one,
3:31
that may not be often enough.
3:42
All she can do is keep trying.
4:23
To prevent her scent betraying her, she
4:26
makes a wide sweep to get downwind of
4:29
the seal.
4:31
Getting
4:42
close.
5:05
She's now right behind the seal.
5:51
Incredibly, she caught the seal.
5:54
underwater.
6:01
It's only small, but even so, its
6:04
blubber alone will contain 100,000
6:07
calories, enough to sustain this bear
6:09
for a week.
6:21
And in that time, she might even catch
6:24
another.
6:34
But this can't go on forever. As summer
6:37
continues, temperatures are rising.
6:41
Each hunt requires more energy,
6:44
draining the bears of their reserves.
7:00
A polar bear stirs.
7:03
She has been in her den the whole
7:05
winter. Her emergence marks the
7:08
beginning of spring.
7:13
After months of confinement underground,
7:16
she toboggins down the slope. Perhaps to
7:18
clean her fur, perhaps for sheer joy.
7:37
Her cubs gaze out at their bright new
7:40
world for the very first time.
7:45
The female calls them. But this steep
7:48
slope is not the easiest place to take
7:51
your first steps.
8:05
But they are hungry and eager to reach
8:08
their mother, who's delayed feeding them
8:10
on this special day. Now she lures them
8:14
with the promise of milk, the only food
8:16
the cubs have known since they were
8:17
born, deaf and blind beneath the snow
8:20
some 2 months ago.
8:26
Their
8:39
mother has not eaten for 5 months and
8:42
has lost half her body weight. Now she
8:46
converts the last of her fat reserves
8:48
into milk for her cubs.
9:09
The spring sun brings warmth, but also a
9:13
problem for the mother. It starts to
9:16
melt the sea ice. That is where she
9:19
hunts for the seal she needs to feed her
9:21
cubs. and she must get there before the
9:24
ice breaks up.
9:29
For now though, it's still -30° and the
9:33
cubs must have the shelter of the den.
9:53
Meadows that only a few weeks ago were
9:55
buried beneath the snow are now full of
9:59
life.
10:17
But in these mountains, the good times
10:20
will not last long.
10:23
So the bears must feed as fast as they
10:25
can.
10:30
During the summer months, an adult can
10:32
put on 180 kilos gorging on plants. And
10:37
if they can catch them,
10:40
a moment or two.
10:46
But just now, the bears have something
10:48
else on their minds.
10:53
It's becoming warmer, and the bears are
10:56
keen to shed their thick winter coats.
11:02
Mothers show the culls what to do about
11:04
this.
11:15
They'll soon catch on.
11:20
Some trees, it seems, are particularly
11:22
suitable for rubbing.
11:25
Bears have their favorites and will
11:27
travel long distances to visit them.
11:33
Some itches just have to be scratched.
11:56
There are now around 30 bears in this
11:59
one valley.
12:07
As they rub, each leaves an individual
12:10
and recognizable scent.
12:16
So, the tree soon carries a list of
12:18
who's around,
12:20
which might help individuals to avoid a
12:22
fight.
12:25
To best spread their scent, they only
12:28
have to put their back into it.
12:42
Oh,
13:10
heat, heat.
13:11
But summer is short. Itches
13:15
satisfactorily scratched.
13:17
It's time to eat.
13:22
In a couple of months, they will have to
13:24
return to their dens to hibernate.
13:27
So now they must put on as much weight
13:29
as they can.
13:30
>> Mr. Nakayyama has been keeping honeybees
13:32
for more than 65 years,
13:35
and these sunny forest clearings are
13:37
perfect for his hives.
13:47
But every year, Mr. Nakayyama's hives
13:50
come under attack.
13:56
Whatever it is seems to be unfased by a
13:58
swarm of angry bees.
14:06
Mr. Naki armor has put an electric fence
14:08
around his precious hives, but even this
14:11
doesn't seem to be keeping the culprit
14:13
out.
14:18
So, he's called in some experts and
14:20
they've set up an elaborate trap laden
14:23
with honey.
14:41
All they can do now is wait.
14:50
And it doesn't take long. Within just a
14:53
few hours, news comes in that the trap's
14:56
been tripped.
15:06
Professor Izumi and his team are here to
15:09
help.
15:12
>> Although it's wise to tranquilize it
15:14
first.
15:23
>> It's a young black bear.
15:27
He strayed dangerously close to the edge
15:29
of human habitation looking for
15:31
something to eat.
15:35
>> Black bears have attacked people in the
15:37
past.
15:38
So for everyone's sake, he can't stay
15:41
here.
15:50
>> There's just enough room for the bear in
15:52
the boot.
15:56
He needs to be returned to the safety of
15:58
the mountain,
16:00
but it's a 1-hour drive.
16:05
The bear could awake at any time,
16:09
and there's no cage.
16:12
In this rural area, bear expert
16:15
Professor Izumiyama is used to taking
16:17
this chance.
16:28
They need to take the bear as deep into
16:30
the mountain wilderness as possible.
17:02
This is the most anxious time for the
17:05
professor.
17:20
Thanks to Professor Izumi, this lucky
17:23
bear is back in the safety of the forest
17:25
and out of harm's way.
17:30
>> One of the most successful snow animals
17:32
is solitary and lives most of its life
17:35
alone.
17:37
They can be found in the very far north
17:39
of the Arctic.
17:42
The polar bear.
17:46
This male, like every polar bear, is
17:49
almost completely covered in fur.
17:53
But his secret to staying warm in this
17:55
frozen land is actually inside his large
17:58
body.
18:00
He has a huge layer of insulating fat
18:04
about 10 cm thick. It traps heat,
18:08
keeping him warm from the inside.
18:12
To maintain this fat, he relies on his
18:14
good hunting skills.
18:18
His prey is hidden under the thick ice.
18:24
Luckily, he has a secret weapon to help
18:27
him hunt.
18:28
An extraordinary sense of smell,
18:33
100 times stronger than ours.
18:44
He can detect a seal carcass from 30 km
18:48
away
18:50
and under a meter of snow.
19:20
success.
19:22
He will eat all the fat of a seal first,
19:26
often leaving the actual meat.
19:30
This extreme fatty diet would kill us,
19:34
but for the polar bear, it's essential.
19:38
Indeed, they are one of the fattest
19:41
mammals on Earth.
19:45
Their incredible insulation and intense
19:48
sense of smell make the polar bear a
19:51
master in the snow.
19:55
They're also built to move around
19:57
effortlessly in this snowy environment.
20:01
Unlike me,
20:04
I am a perfect example of an animal that
20:08
is not adapted for walking about a snowy
20:12
environment like this.
20:16
I'm 12 stone, 12 1/2 stone, and all of
20:19
my weight is distributed
20:22
onto my feet. Size 12. Big feet for a
20:25
human, but not big enough to stop me
20:27
from sinking down into the snow. What I
20:31
need to do is increase that surface
20:34
area. Put on some snowshoes.
20:41
Suppose the secret to moving around in
20:43
deep snow is to do it efficiently.
20:47
There we go. Adapted for walking in the
20:51
snow.
20:53
That is so much better. It's easy. I can
20:57
walk through the forest. I'm not sinking
20:59
down into my waist. I can go fast. I can
21:02
almost go silently
21:05
like I belong here.
21:17
Polar bears have builtin snowshoes.
21:20
Their paws are wide, measuring about 30
21:23
cm across.
21:25
This helps them to distribute their
21:27
weight evenly on thin ice.
21:30
Underneath their large paws are small
21:33
soft bumps to give them extra grip on
21:36
the ice.
