Every bird family but one has lice , and there is a species of bird , the great tinamou , that harbors 18 different species of lice , perhaps because it has many different kinds of feathers , each offering a special niche .

除一种鸟外所有的鸟类都有虱子，而一种鸟大共鸟身上有18种不同的虱子，可能是因为它有很多不同的羽毛提供了不同的生存机会。