熊猫喜欢倒立着撒尿，兔子会把拉出来的便便吃进去再消化一遍，树懒一周会下树尿一次，动物界普遍有21秒撒尿时间的黄金定律，河马用甩便便的方式决出种群中最强壮的那一个......这本书通过科学家爷爷和小孙子的视角讲述了十余种动物拉便便的趣味知识，有趣好玩的现象背后有着大自然潜藏的科学规律和生存规则。
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