同样是暖血动物而且效率更高、适应性更强的捕食者，人类，成为这些哺乳动物的日益迫近的威胁。
Trouble has closed in on these mammals in the form of equally warm-blooded and even more efficient and adaptable predators, humans.
同样是暖血动物而且效率更高、适应性更强的捕食者，人类，成为这些哺乳动物的日益迫近的威胁。
Trouble has closed in on these mammals in the form of equally warm-blooded and even more efficient and adaptable predators.
我们认为卷尾燕已经进化到警示斑点鹃自己的存在。通过帮助斑点鹃种群更有效率地捕食来寻找更多偷取食物的机会。
We think that drongos have evolved to alert babblers to their presence because helping the group forage more effectively leads to more frequent opportunities for theft.
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