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Don Ohmes <email@example.com> wrote:
> OK. But the implied point of the question is still valid -- given that hair
> and feathers have evolved separately, and closely related lice inhabit both
> mammals and birds, it is hard to construct an overview of the louse world
> that does not involve some host-switching...
Certainly. One of the hypotheses favored by the Smith &c paper was
that parasitic chewing lice were first acquired by birds (or other
feathered dinosaurs) and then switched to mammals.
Fleas likely went in the opposite direction. Even monotremes have them.