它还有一条细长的尾巴，这是哺乳动物的典型特征，今天的鲸鱼没有保留这一特征。
It also had a long thin tail, typical of mammals, something we don't see in today's whales.
关于返祖的一个有力例证就是人类的尾骨，它是哺乳动物尾巴的遗留物。
One striking example of an atavism is the human coccyx, or tailbone, which is a relic of the mammalian tail.
哺乳动物用它起平衡身体、传递信号和支撑物体的作用，尾巴在猿猴和人类中已经消失了。
Useful for mammals that use tails for balance, species-to-species signaling, and support, the tail is missing in apes and in humans.
熊一种通常具危险的熊科哺乳动物，有浓密的毛发和短尾巴，行走时脚的较低表面触地。
Ursidae that have a shaggy coat and a short tail and walk with the entire lower surface of the foot touching the ground.
熊一种通常具危险的熊科哺乳动物，有浓密的毛发和短尾巴，行走时脚的较低表面触地。
Ursidae that have a shaggy coat and a short tail and walk with the entire lower surface of the foot touching the ground.
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