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Peaks on the equator, such as mount Kenya, are frost bound for only a few hours each night.
在赤道上的山峰，如肯尼亞山，每晚只有幾小時的時間是凍結的。
But north of the equator, in the 750-mile-long European alps, the cold endures for months.
但位于赤道北邊、長750英里的歐洲阿爾卑斯山脈，有好幾個月處于寒冷之中。
The high mountains are continuously frozen for half the year.
這些高山有半年都持續在冰封之中。
A testing time for the alps' greatest aerial predator. The golden eagle.
對于阿爾卑斯山最厲害的空中掠食者，是考驗的時間。金雕。
In winter, there is just enough prey up here, dead or alive, to sustain them.
冬天時，這里只有剛好夠它們生存的獵物，有活的也有死的。
But when spring arrives, the mountains are transformed.
但當春天來臨，山里的環境也會改變。
For a male and his lifelong partner, the need to find food is urgent.
對于雄性和它一輩子的伴侶，找食物的需求很緊急。
They have a three-week-old chick. It needs to be fed several times a day.
它們有只三周大的雛鳥。它一天需要被喂食好幾次。
To do that, both parents have to hunt.
為了喂它，雙親都得出外狩獵。
Yet, even in spring, few animals live up here in the high mountains, and finding prey is not easy.
但即使在春天，住在高山上的動物還是很少，找獵物并不簡單。
But chamois, a kind of mountain goat, are here, and they are giving birth.
但是歐洲山羚，一種山羊，在這生活而且正在生產小羊。
One of their kids can weigh as much as an eagle.
它們的小孩可達到跟雕一樣的重量。
When eagles hunt as a pair, they co-ordinate their approach.
當雕成對狩獵時，它們會互相協作。
One stoops... reaching a speed of over 150mph.
一只俯沖...速度超過時速150英里。
Its attack scatters the herd. And that makes it easier for the other to select a target.
它的攻擊會把山羊群打散。讓另一只雕更容易選擇目標。
A successful catch.
一次成功的抓捕。
It could still be alive. So the eagle carries it away, high over the gorge.
山羊可能還活著。所以雕把它抓到峽谷上的高空。
And then... deliberately drops it. The impact will kill it instantly.
然后...刻意丟下它。撞擊力會立即殺死它。
