But they do not (as, for example, lice do) live on their hosts continually. Once a bird fledges, therefore, it leaves its parasites behind.
但是它们不会一直寄生在它们的宿主身上(虱子才会)，当鸟儿羽翼丰满时，鸡蚤就会离开。
In the same way, species of lice on living animals and birds reflect the splits in animal and bird ancestry back to the time that lice first arose.
通过分析动物以及鸟类身上的虱子，同样能够折射出鸟兽的进化历程。
In the same way, species of lice on living animals and birds reflect the splits in animal and bird ancestry back to the time that lice first arose.
通过分析动物以及鸟类身上的虱子，同样能够折射出鸟兽的进化历程。
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