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Re: Could a viral infection have triggered feather evolution?

Well, surely an almost entirely speculative subject, but I was
wondering if a viral infection could have being at center of the
feather origin in maniraptorian dinosaur lineage

The structures in question are warts. Feathers are elongated and opened scales instead.

(some people think that a viral infection could have triggered
mammalian placenta origin too).

Well, one of the gene promoters involved comes from an endogenous retrovirus.