然而，到了1750年，猎人们也开始瞄准附近的海獭种群。
However, by 1750, hunters had also targeted nearby sea otter populations.
火海胆鲜红的颜色警告捕食者它的刺有毒。海獭是海胆的主要捕食者。
The bright red color of a fire urchin warns predators that its spines are poisonous. Sea otters are the major predators of sea urchins.
海獭的减少会使海胆的数量增加，因为海獭以此为食，从而增加海胆对海藻林的食草压力。
Fewer otters would have allowed sea urchin populations on which the otters preyed to expand and the urchins' grazing pressure on kelp forests to increase.
海獭是海胆的主要捕食者。
蒙特里海湾水族馆也致力于挽救海獭。
蒙特里海湾水族馆也致力于挽救海獭。
第二个将要实现这一成就的王国是一种海獭。
The second kingdom to accomplish this is a form of sea otter.
亚当：对。有一种海獭的栖息地也受到危害。
Adam: yes there's a particular kind of sea otter whose habitat is threatened.
没了海獭约束海胆，海胆的数量变得庞大起来。
Without sea otters keeping sea urchins in check, their population has exploded.
员工和海獭扮成圣诞老人和驯鹿的样子令在场的观众很高兴。
Employees, and sea otters are dressed as Santa Claus and reindeers, attracting the audience.
海獭来自加拿大。
而又当海狮的数量变少后，虎鲸又开始猎杀海獭了。
When the sea lion population crashed, they started fishing sea otters.
在那些逆戟鲸很容易进入的海域，海獭的数量急剧减少。
In those locations that orcas can access easily, the number of sea otters has declined greatly.
成批海獭为躲开油污，爬上浮桥，在有限面积里挤作一团。
A great number of sea otters climbed on the float bridge and huddled together to avoid oil.
一旦贝类遭到损害，便会减缓以贝类为食的海獭种群的恢复。
The damage to the shellfish, in turn, slowed the recovery of otters, which feed on the mollusks.
目前的研究表明天敌捕食是最可能导致海獭数量减少的原因。
Well, ongoing investigations have revealed that predation is the most likely cause of sea otter decline after all.
海獭数量的增减取决于它们生存的地方逆戟鲸是不是可以进入。
What happens to otters seems to depend on whether the location where they live is accessible to orcas or not.
但是，小海獭们对人类没有惧怕之心，这使他们的生存陷入险境。
But the otters lost their fear of people, and that endangered their survival.
而那些过浅和充满岩石的海域，恰恰是海獭数量保持稳定的地区。
And shallow and rocky locations are precisely the types of locations where sea otter populations have not declined.
如今，海獭受到了保护，它们的数目也增长到大约150,000。
Today the otters are protected, and their Numbers have swelled to perhaps 150, 000.
如今，海獭受到了保护，它们的数目也增长到大约150，000。
Today the otters are protected, and their numbers have swelled to perhaps 150,000.
俄勒冈动物园的工作人员必须要想办法帮助海獭埃迪对抗关节炎疾病。
Keepers at the Oregon Zoo had to come up with a way to help Eddie the Sea Otter cope with arthritis.
如果污染造成的疾病感染导致了海獭数量的剧减，那么情况不该如此。
That's not what you would expect if infections caused by pollution started killing a lot of otters.
如果那些海獭会说话，他们就会劝弗兰岑振作起来，冷静下来，去尝尝海胆。
If they could talk, the otters would tell Franzen to man up, chill out and have a sea urchin.
第三，海獭数量变化的不均衡性恰好表明了逆戟鲸捕食理论比污染理论更合理。
And third, the uneven pattern of otter decline is better explained by the orca predation theory than by the pollution theory.
一只年幼的小海獭正在加利福尼亚的蒙特雷湾欢快地嬉戏，一点儿也没在意边上的潜水员。
A young sea otter frolics in Monterey Bay, California, as a diver watches nearby.
海獭重新在阿拉斯加威廉王子湾玩耍，大马哈鱼和其他一些物种的数目也出现反弹。
Sea otters once again play in the waters of Alaska’s Prince William Sound, and salmon and some other species have rebounded.
这些海獭还用它们的玩具去打击水池中的墙壁，以此来娱乐站在它们面前观看的游客。
The otters hit their toys against the walls of the tank in front of the happy visitors.
这些海獭还用它们的玩具去打击水池中的墙壁，以此来娱乐站在它们面前观看的游客。
The otters hit their toys against the walls of the tank in front of the happy visitors.
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