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Giant salamanders, the world's largest amphibian, almost two metres long.
大鯢——世界上最大的兩棲動物，幾乎能長到2米長
They're the only large predator in these icy waters. They begin their hunt at night.
它們是這些冰水中唯一的大型掠食動物。夜幕降臨，它們開始捕獵
These salamanders have an exceptionally slow metabolism.
大鯢的新陳代謝十分緩慢
Living up to 80 years, they grow into giants.
它們能活80多年，因此長得十分巨大
The fish they hunt are scarce and salamanders have poor eyesight.
可供大鯢捕食的魚非常稀少，而且它們的視力也很差
But sensory nodes on their head and body detect the slightest changes in water pressure.
可是它們頭上和身上的感官突起能覺察出最輕微的水壓變化
Free from competition, these giants can dine alone.
由于沒有競爭，這些大家伙得以獨自享用美食
Pickings are usually thin for the salamanders,
大鯢的收獲通常都比較少
but every year some of the world's high rivers are crowded by millions of visitors.
而世界上的高山河流每年都將迎接成千上萬的來訪者
The salmon have arrived. This is the world's largest freshwater fish migration.
鮭魚來了。這是世界上規模最大的淡水魚洄游
Across the northern hemisphere, salmon, returning from the ocean to their spawning grounds,
鮭魚穿越整個北半球，從海洋回到它們的產卵地
battle their way for hundreds of miles upstream.
奮力逆流而上數百英里
Up here there are fewer predators to eat their eggs and fry.
只因上游很少有捕食魚卵和魚苗的掠食者。
