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The pack ice is returning and the arctic whales mustn't linger.
浮冰群就要重現(xiàn)，而北極的鯨類已不可逗留此地。
Bowheads, belugas and narwhals head for open water on the southern edge of the Arctic Ocean.
弓頭鯨、白鯨以及角鯨紛紛向北冰洋南端的開闊水面游去。
A thirty thousand square kilometers of ocean turns to ice everyday.
每天有三萬平方公里的海面凍結(jié)成冰。
As the days grow colder, millions of seabirds flee the coming darkness of the polar winter.
隨著天氣越來越冷，幾百萬只海鳥趕在黑暗的冬季來臨前逃離北極。
In Hudson bay, the polar bears are still waiting for the pack ice to spread south.
在哈德遜灣，北極熊們?nèi)栽诘却”鶇^(qū)向南擴散。
As November approaches, the usually solitary males not only tolerate each other's presence, they even begin to socialize.
接近十一月的時候，通常喜好獨居的公熊們不僅變得相互容忍對方的存在，甚至開始相互交際。
With no food or females to compete over, these play fights are harmless, but the contests mean each bear can gage the strength of its opponents.
由于沒有食物或配偶可爭，這種游戲般的打斗毫無傷害，但這樣的比賽卻可以使每頭公熊估量出對手的實力。
If they meet again during the mating season next spring, they must fight to win access to females.
假如它們來春的交配期再次相遇，它們就必須一戰(zhàn)以贏得母熊的芳心。
As winter closes in, the sea ice spreads south to Hudson bay.
隨著冬季的臨近，海冰逐漸向南擴散到哈德遜灣。
For the polar bears, the return of the ice means respite from their hunger is finally insight.
對于北極熊來說，冰的回歸意味著饑餓可以等到緩解。
They can at last head back to their hunting grounds in the frozen ocean.
它們終于可以重返這冰凍海面上自己的捕獵場了。
Like all the animals that live above and below the ice, the polar bears have adapted to survive in one of the most hostile habitats on earth - the Arctic Ocean.
與所有生活在冰層上下的動物一樣，北極熊們已經(jīng)適應(yīng)，并且能夠生存在地球上環(huán)境最惡劣的棲息地之一：北冰洋。
