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Predator vs Prey Showdowns Narrated by Sir David Attenborough | 4K UHD | BBC Earth - Video học tiếng Anh
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Predator vs Prey Showdowns Narrated by Sir David Attenborough | 4K UHD | BBC Earth
Predator vs Prey Showdowns Narrated by Sir David Attenborough | 4K UHD | BBC Earth
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Legendas (214)
0:00
At this time of year, polar bears, on
0:02
average, succeed only once in [music] 20
0:06
hunts.
0:12
If the hunter is skinny, like this one,
0:15
that may not be often enough.
0:25
All she can do is keep trying.
0:35
>> [music]
0:41
[music]
0:47
[music]
1:06
>> To prevent her scent betraying her, she
1:09
makes a wide sweep to get downwind of
1:12
the seal.
1:25
Getting close.
1:48
She's now right behind the seal.
2:35
>> Incredibly, she caught the seal
2:37
underwater.
2:44
It's only small, but even so, it's
2:47
blubber alone will contain 100,000
2:50
calories, enough to sustain this bear
2:52
for a week.
3:05
And in that time, she might even catch
3:07
another.
3:17
But this can't go on [music] forever.
3:20
As summer continues, temperatures are
3:22
rising.
3:24
Each hunt requires [music] more energy,
3:27
draining the bears of their reserves.
3:35
To help her in her quest, she's equipped
3:38
with three superpowers.
3:42
First,
3:43
an amazing approach [music] to getting
3:45
about.
3:52
Portia is a jumping spider.
3:58
Able to leap up to 50 times her own body
4:01
length.
4:06
Nowhere seems beyond her reach.
4:12
Next, her second superpower, superb
4:16
eyesight.
4:19
Essential
4:20
if she's to distinguish her prey in all
4:22
this clutter.
4:25
Because her prey doesn't stray.
4:32
Portia is a spider-eating [music]
4:35
spider.
4:39
This raises a few problems.
4:42
Her lunch is three times her size.
4:47
Packed with venom.
4:50
And surrounded by a sticky trap.
4:56
Mission impossible?
4:58
Not at all. Because of her third
5:01
superpower.
5:04
Portia is a genius.
5:10
She can map her world in three
5:12
dimensions.
5:14
And formulate a plan of attack.
5:20
She can have an idea.
5:42
The web builder is blind.
5:46
It won't have a clue that she's coming.
6:12
Right on target.
6:14
And safely behind those fangs.
6:25
But a mind as active as Porsches can
6:28
always do with more brain food.
6:35
Here, there's no anchor point for the
6:37
abseil.
6:42
But Porsha has another idea.
6:48
Instead of going to the spider,
6:56
she will bring the spider [music]
6:57
to her.
7:03
She plucks the strands to imitate
7:06
struggling prey.
7:13
Drawing the spider in
7:19
to its death.
7:25
Their cover blown,
7:28
escape seems impossible.
7:39
But these particular fish have a unique
7:42
ability.
7:47
>> [music]
7:51
[music]
7:57
>> They're flying fish.
8:04
>> [music]
8:17
[music]
8:22
>> With an extra thrust from their tails,
8:24
the flying fish get airborne once more.
8:28
>> [music]
8:35
[music]
8:35
>> With a good wind, they can glide for
8:37
hundreds of meters.
8:45
>> [music]
8:50
[music]
8:57
>> But this is just what the frigate birds
8:59
have been waiting for.
9:05
When frigates join the hunt, the flying
9:07
fish are literally caught between the
9:10
devil
9:13
and the deep blue sea.
9:19
>> [music]
9:27
[music]
9:34
>> If the flying fish get too much lift,
9:37
they become easy prey for the frigate.
9:42
>> [music]
9:51
[music]
9:54
>> If they dive to evade attacks from
9:56
[music] above,
10:02
they could fall into the mouths of the
10:04
dorado.
10:15
>> [music]
10:22
[music]
10:36
>> The Namib desert,
10:37
one of the most exposed places on Earth.
10:46
As the sun climbs high, everybody takes
10:50
cover from the extreme heat.
10:55
Everybody except
10:58
the hot rod ant.
11:05
As others take refuge,
11:08
their day is just beginning.
11:13
Cleaning out the nest.
11:22
The sand can reach a scorching 70°
11:27
The ants' long legs raise their bodies
11:29
above the surface where it's 10° cooler.
11:37
But, if they stand [music] still, they
11:38
will fry.
11:42
They must keep moving or risk the same
11:45
fate as their quarry, the creatures that
11:47
have collapsed from heatstroke.
11:51
Too deeply buried, but a good place to
11:53
cool off.
11:57
Foraging decisions must be fast.
12:00
Too big?
12:05
Perfect.
12:09
Back to the nest before they also die.
12:19
But, they've strayed into a minefield.
12:27
Each of these strange cone-shaped pits
12:30
is a death trap
12:37
with a brutal predator at its center.
12:42
Here lie antlion larvae, tiny ambush
12:46
predators with venom-filled pincers.
13:10
Some ants manage to escape,
13:13
but the antlion has other tricks.
13:16
Flinging sand into the air, he creates
13:18
an avalanche.
13:26
In this cone [music] of death, the walls
13:28
are so angled that the sand slips
13:30
beneath the ant's feet.
13:36
As boulders rain from the sky, escape
13:39
seems almost impossible.
13:55
>> [music]
13:58
>> Phew.
14:00
Lions will normally avoid hunting in
14:03
such heat.
14:07
But they're also opportunists.
14:28
>> [snorts]
14:31
>> The lions will need to bring him down
14:32
quickly before they overheat. [music]
15:09
Even away from the herd, a bull is a
15:12
formidable opponent.
15:15
It could gore and kill a lion.
15:33
>> [music]
15:51
[music]
16:11
>> Close to overheating, they finally
16:14
succeed in bringing him to the ground.
16:30
But the massive bull is not giving up.
16:45
Against the odds and the full weight of
16:47
the lions, he regains [music]
16:50
his feet.
16:57
>> [music]
16:57
>> And it is now that the tables turn.
17:06
The lions are exhausted.
17:09
After a 20-minute struggle, only the
17:12
bull has the energy to finish the fight.
17:37
>> In such exposed and extreme conditions,
17:41
the challenge for predators and their
17:43
prey
17:44
is at its most intense.
17:50
Even when more sea lions arrive, they
17:53
can't seem to break down the sardines'
17:55
coordinated defenses.
18:15
With a shoal this big, the sea lions
18:17
need to isolate a smaller, more
18:19
manageable group of fish.
18:27
But with so few predators, the fish
18:29
still have the advantage.
18:36
All the sea lions can do is keep the
18:39
sardines at the surface
18:41
and wait for others to join them.
18:53
Tuna.
18:55
Their arrival changes everything.
19:10
Tuna attack from below, cutting off the
19:13
sardines' escape route down to deeper
19:15
water.
19:25
Next to [music] appear, shearwaters.
19:28
Excellent flyers, but also surprisingly
19:31
agile underwater.
19:36
With so many predators attacking from
19:38
all sides, the advantage starts to shift
19:42
away from the sardines.
20:04
As the fish pack ever tighter,
20:06
their schooling strategy now makes it
20:08
easier for the hunters.
20:35
Copper sharks.
20:37
They've scented blood in the water.
20:41
>> [music]
20:46
>> Surprisingly, perhaps, the predators
20:48
never attack one another. They work
20:50
together to corral the ball of fish,
20:53
taking turns to grab a mouthful.
21:05
Common dolphins.
21:10
As the shoal gets ever smaller, each
21:12
sardine scrambles desperately to hide in
21:15
the middle.
21:17
But now, there's no escape.
21:38
A Bryde's whale
21:40
finishes off the feast.
21:42
Tons of sardines devoured in less than
21:46
an hour.
