尾巴
尾巴，是指垃拉动物体背部尾端个部分，特别是指构造柔韧可弯曲、外加明显分开躯干个附肢部分，大致上相当于哺乳动物搭鸟类个骶骨（荐骨）搭尾骨。一般来讲尾巴是脊椎动物个专属特征，然而有些无脊椎动物也拥有类似尾巴个构造。
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