然而，专家认为巴基鲸是已经灭绝的食肉哺乳动物中爪类和鲸类之间的过渡物种。
Other features, however, show experts that Pakicetus is a transitional form between a group of extinct flesh-eating mammals, the mesonychids, and cetaceans.
相比之下，当幼龙虾在没有牡蛎片的光滑鱼缸中饲养时，大多数都发育出了两个刀爪。
In contrast, when juvenile lobsters were reared in a smooth tank without the oyster chips, the majority developed two cutter claws.
在一些动物中，侧化只是对单爪或单脚的偏好，而在另一些动物中，则表现为更普遍的行为模式。
In some animals, lateralisation is simply a preference for a single paw or foot, while in others it appears in more general patterns of behaviour.
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