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Their huge mouth are the biggest in the animal kingdom and they house massive baleen plates.
它們的巨嘴是動物王國中最大的，而這大嘴中生有巨大的鯨須板。
These are used like sieves whilst feeding.
鯨須板在進食時起到篩子般的作用。
To feed, bowheads scoop in dense shoals of crustaceans along with lots of seawater.
弓頭鯨進食時會將密集的大群甲殼動物與大量海水一起吞入口中。
The whales push the water out, and the crustaceans core within the baleen, then swallowed.
然后將海水吐出而將甲殼動物擋在鯨須板內咽下。
Because of the extreme cold, bowheads have a very slow metabolism and can live for over two hundred years.
由于生存環(huán)境極度寒冷，弓頭鯨的新陳代謝速度極慢，它們因此可以活到兩百歲以上。
Summer is a time of plenty for most, but for polar bears, finding food is becoming difficult.
夏季對大多數(shù)(動物)來說都是個富足的季節(jié)，但是對北極熊來說，覓食正變得愈發(fā)困難。
Their hunting platform, the sea ice, is disappearing beneath their feet. Without the ice, it's almost impossible to catch seals in the open ocean.
它們的捕獵平臺-海冰，正在腳下消失。沒有了冰層，要在開闊水面捕捉到海豹幾乎是不可能的。
For a hungry bear, an unsuspecting guillemot is not below consideration.
對于饑餓的北極熊，不期而遇的海鳩也能讓它殺機頓起。
But guillemots are agile swimmers, and when they dive, the bear can not follow them.
不過海鳩是敏捷的游水好手，一旦潛入水中北極熊就無法尾隨其后了。
Though wet makes hunting more difficult, polar bears can swim great distances.
盡管海水使捕食更加困難，北極熊卻能游很遠的距離。
They've been known to swim up to a hundred kilometers in a day.
它們可以在一天之內游到一百公里的里程。
They have huge poshly webbed feet that make effective paddles
它們有完美的蹼狀腳掌，劃起水來像船槳一般。
But aquatic stalking expense vital energy reserves and is rarely successful.
但在水中跟蹤獵物要耗費大量體能，所以很少能成功。
As the ice floors melt, bears head for solid ground.
隨著冰面融化，北極熊紛紛向陸地進發(fā)。
By June, the ice is virtually disappeared from the southern stretches of the Arctic Ocean.
到了六月，北冰洋南部的冰層實際上已完全消失了。
With no ice floors to hold out on, a colony of pacific walrus has taken up residence on the beach.
沒有了冰面可棲息，一群太平洋海象來到海灘上休息。
