地球脉动（2006）

The survival of both creatures
取决于能否挖到地面的食物
depends on getting through to the ground.
对于美洲野牛来说 用蛮力就可以做到
For the bison, it will be a matter of brute strength.
强大的颈部肌肉让他们每天可以铲五吨♥的雪
Massive neck muscles enable them to shovel five tonnes of snow a day.
他们小巧的邻居则需要更高的准头
Their light-weight neighbour needs more precision.
美洲野牛达到了目的
The bison have reached their goal,
一大口枯草
a mouthful of withered grass.
在美洲野牛挖过的地方狐狸也见缝插针
And where the bison have dug, the fox now spots an opportunity.
每一步都至关重要
Every footstep counts,
但是时机...
but he mustn't break through...
还未到
Yet.
他仔细监听着猎物的一举一动
He listens carefully to pinpoint his target.
它在移♥动♥
It's moving.
一只野鼠
A vole.
虽然小 但是比一嘴干草的
Small, but 100 times more nutritious
营养价值高上百倍
than a mouthful of dried grass.
想要在这草原上度过严冬
To get through the winter on these prairies,
有时候脑子比蛮力更加重要
sometimes brain beats brawn.
最终 所有草原上的生物
Ultimately, life on all grasslands
都依赖于季节的更迭
depends on the turn of the seasons.
在树木生存极限八百公里以北的地方
Five hundred miles further north than any tree can survive,
青草春风吹又生
grass returns to life.
雌性北美驯鹿远赴北方
Caribou females have journeyed to the far north
来此产仔
to calve.
超过七万只驯鹿幼崽
Over 70,000 caribou babies
将在几天内出生
will be born in the next few days.
小鹿出生的时候
As the calves appear,
也正是青草发新芽的时候
so too do the leaves of the newly sprouting grass.
幼鹿必须迅速增强体能
And the calves must strengthen quickly.
几天内他们就将跟随自己的父母
Within days they will have to keep up with their parents
踏上无尽的征程
on a never-ending march.
第一天 他们的速度就已经超过人类短跑健将
At one day old, they're already faster than an Olympic sprinter.
他们正在测试自己跋山涉水用的四肢
They're testing the legs that will carry them thousands of miles,
最好现在就知道极限在哪里
better to learn their limitations now.
看起来很好玩 但草原上最艰苦的生活
It may look playful, but there's no harder life on the grasslands
正等着这些他们
than that facing these infants.
母驯鹿现在聚集起来
The caribou mothers now join together,
每只都带着一只同样大小的幼鹿
each with an infant exactly the same age.
她们准备启程
They're setting off on the greatest
进行陆地上最伟大的长途跋涉
overland trek made by any animal.
但是无论草食性动物走到哪里
But wherever grass eaters travel,
都有捕食者等待着他们
predators lie in wait.
就是他们 北极狼
Here they are, Arctic wolves.
他们必须要在
They must seize their chance
驯鹿经过领地时把握住机会
while the caribou pass through their territory.
北极狼跑向鹿群
The wolf runs at the herd,
试图冲散群体中的弱者
trying to flush out the weak or the slow.
一只幼鹿走散了
A calf is separated.
狼全力以赴捕猎的时速将近六十公里
At full tilt, 40 miles an hour,
只比小鹿快一点点
the wolf is just faster.
但是幼鹿的耐力更好
But the calf has stamina.
虽然只有几周大
Only a few weeks old,
这只幼鹿的求生欲望让人叹为观止
and this calf's will to survive is remarkable.
而且必须如此
And it needs to be,
这些幼鹿开始了一场
for these young caribou have now started a journey
终其一生的旅程
that will last a lifetime.
永远追寻着他们所需要的
Forever chasing the seasonal growth of the grass
季节性生长的青草
on which they depend.
和其他草原生物一样 他们依赖着
Like all grassland creatures, they are at the mercy
这变化莫测而又极其慷慨的大草原
of these unpredictable but ultimately bountiful lands.
青草可以在地球上最为极端的环境下生长
Grass can survive some of the harshest conditions on earth,
经受洪水 火灾和冰霜的考验仍然生机盎然
flood, fire and frost, and still flourish.
所以草原为地球上
So it is that grasslands provide a stage
最壮观的野生动物群提供了舞台
for the greatest gatherings of wildlife on planet earth.
下集预告
Next time,
我们向地球上最新的栖息地进发
we venture to the newest habitat on Earth,
我们的城市
our cities.
揭示在这个人造的世界中
To reveal the extraordinary ways
动物们神奇的生存方式
that animals survive in this man-made world.