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>> The problem is that flight evolution among vertebrates is not _that_ rare.
>  And it has occurred several times in inverts, as well, I believe.

As far as I am aware flight has only evolved once in invertebrates, in
Insecta, and four times in vertebrates: in Pterosauria, birds, bats and
gasteropelecid hatchetfishes.
Ronald I. Orenstein                           Phone: (905) 820-7886 (home)
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