As for tiger penis or tiger bone, because creatures of the cat family have the ability to propagate quickly, the numbers of big cats in many zoos --given conditions where they eat their fill, get enough sleep, and have little to do--is growing rapidly.
至於虎鞭、虎骨，由於貓科繁殖能力強，今天很多動物園裡的貓科動物，如獅子、老虎，在吃好、睡足，又無事可做的環境下，數量暴增。