Contagious: a human head louse clings to a strand of hair.
感染力：附着在一根头发上的人类头虱。
The human head louse, for instance, evolved from the chimpanzee louse when the ancestors of humans and chimps split apart some five million years ago.
例如，人头虱是500万年前当人类祖先与黑猩猩分化时从黑猩猩身上的虱子进化来的。
So biologists have long been puzzled over the fact that the human head louse is a sister species to the chimpanzee louse, but the pubic louse is closely related to the gorilla louse.
所以生物学家长期为此困惑：为什么人类的头虱是黑猩猩虱子的近亲。而阴虱却是大猩猩虱子的近亲。
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