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.
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.
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