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A chick can eat up to a third of its own body weight in a day.
一只雏鸟一天可以吃下自己的体重三分之一的食物。
Parents can't afford to rest for long.
父母没办法休息太久。
Taking advantage of the long summer days, eagles hunt ceaselessly. Day in, day out.
利用夏季比较长的白天，雕不断地狩猎。日复一日。
After eight weeks, a chick is almost fully grown.
八周之后，雏鸟几乎发育完全。
And then, as summer comes to an end, the pressure on parents to feed their chicks disappears.
随着夏天的结束，父母喂食它们雏鸟的压力也随之消失。
Their young have flown the nest. And just in time.
它们的孩子已经飞离鸟巢。时机正好。
The worsening weather signals that the leaner times of winter are on their way.
越来越差的天气，透露出冬季的萧条期即将到来。
Finding prey has now got much harder.
将会更难找到猎物。
The young chamois have also grown up.
年轻的欧洲山羚也已经长大。
A juvenile now weighs almost five times as much as an eagle.
一只青年欧洲山羚体重已经几乎是雕的五倍了。
Animals of this size are no longer easy prey for the birds.
这种大小的动物，对鸟来说再也不是简单的猎物。
They barely flinch under attack.
它们面对攻击时几乎不会退缩。
But it's dangerous for a chamois to stray close to a cliff edge.
但对于欧洲山羚来说，游走在悬崖边还是很危险。
The eagles seize their chance. Got it.
雕抓住机会。成功了。
The eagle drags the chamois towards the edge. It's an extremely risky move.
雕把欧洲山羚拖到悬崖边。这是一个极度冒险的举动。
If the eagle breaks a wing, it will be fatal.
如果雕折断了翅膀，将会是致命伤。
A kill this size will feed a pair for days.
这种尺寸的猎物，能让雕夫妻吃好几天。
This is when they must build up the fat reserves that they will need to sustain themselves through the lean months that lie ahead.
现在正是它们需要储存脂肪的时候，它们会需要脂肪来维持生命，度过未来的萧条月分。
