Paradoxically, the intrusion of another top predator could in someways make life easier for the white bears, says Rockwell.
但洛克韦尔也表示，颇有些自相矛盾的是，另一种大型捕食动物的入侵却让北极熊的生存更为容易了。
But a paper in Biology Letters suggests that even a relatively small protected area can have a positive impact on a top predator - in this case, the African penguin, an endangered species.
但生物学通讯一篇论文提出，哪怕一个相对较小的保护区也可对顶端捕食者产生积极作用，在此指的是濒临灭绝的非洲企鹅。
We now know that its long legs made it a top predator, a mammal that could run down its prey at long distances, particularly, bison.
我们现在知道它的长腿使之成为顶级掠食者，这种哺乳动物能够长距离追逐猎物，特别是野牛。
We now know that its long legs made it a top predator, a mammal that could run down its prey at long distances, particularly, bison.
我们现在知道它的长腿使之成为顶级掠食者，这种哺乳动物能够长距离追逐猎物，特别是野牛。
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