小小的、令人讨厌的虱子是生物学家研究史前生物的宠儿。根据虱子在今天的哺乳动物、鸟类身上的种类和进化情况,生物学家发现,虱子的种类在远古就已经分化出许多类型,说明它们当时的寄主非常多,以至于出现了大量的分化,所以,它 The tiny, nasty louse is the darling of biologists studying prehistoric creatures. According to the species and evolution of lice in today’s mammals and birds, biologists have found that the species of lice have been differentiated into many types in ancient times, indicating that they were so many hosts at that time that there was a great deal of differentiation, So, it