Bowhead whales, however, they're a bit more free-form in their songs.

然而，弓头鲸唱歌时更自由一些。

Some tortoises live for nearly 200 years. Bowhead whales can live even a decade or two longer.

有些海龟活了将近200年。弓头鲸甚至可以比海龟多活一二十年。

Until now it's the bowhead whale you've hunted, and it won't risk going past the warm waters of the equator.

您以前捕捉的都是平常的白鲸，它并木敢冒险通过赤道的温热海水。

Bowhead whales feed on plankton, while ringed seals eat fish and other animals in which mercury has had the chance to accumulate.

因为露脊鲸以浮游生物为食，而环斑海豹则吃鱼和其它可能积聚汞的动物。

But the songs of bowhead whales are freer, she said.

但弓头鲸的歌声更自由，她说。

Instead of the ringed seals they ate out on the ice, the bears are foraging on bowhead whale carcasses, cast up on the beach.

它们不再在冰上捕食环纹海豹，而是开始以被冲上海滩的的露脊鲸尸体为食。

Those animals are only members of the genus Balaenoptera furnished with dorsal fins, and like sperm whales, they're generally smaller than the bowhead whale.

这些东西不过是鲸科，有脊鳍的动物，大头鲸也一样。它们通常比普通白鲸小一些啊！

And ocean dwelling animals like bowhead whales and narwhals aren't immune to these changes either.

弓头鲸和独角鲸等海洋动物也不能幸免于这些变化。

In the past they've scanned an eel, a bowhead whale fetus, and even a shark.

过去，他们扫描过鳗鱼、弓头鲸胎儿，甚至鲨鱼。

Scientists think only male bowhead whales sing and that they are singing to find a mate.

科学家们认为只有雄性弓头鲸会唱歌，而且它们唱歌是为了寻找配偶。

Scientists have studied the bowhead whale, to see if they have different versions of genes than other mammals.

科学家们研究了弓头鲸，看看它们是否具有与其他哺乳动物不同的基因版本。

Mice and rats reach the end of their lives after just four years, while for the bowhead whale, Earth's longest-lived mammal, death can come after 200.

老鼠们的寿命不过4年。但是对于地球上寿命最长的哺乳动物 弓头鲸来说，死亡在200年后才会发生。

The title of longest-lived mammal goes to another Arctic species: the bowhead whale, which was an estimated 211 years old.

寿命最长的哺乳动物的头衔属于另一种北极物种：弓头鲸，估计有 211 岁。

Notable exceptions are the nearly song-like choruses of bowhead whales in summer and the complex, haunting utterances of the humpback whales.

有些值得一提的例外是：巨口鲸在夏天发出的声音几乎是歌曲一样的和声，而座头鲸发出的则是复杂的过耳难忘的声音。

Nelson Nungasat is captain of a whale hunting team. They rely on stable, thick ice to harpoon the 25 bowhead whales they're allowed to take each year for food.

Nelson Nungasat 是捕鲸队的队长。他们依靠稳定、厚实的冰来用鱼叉捕杀他们每年获准捕食的 25 头弓头鲸。