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Re: origin of bats/reply to J. Headden
David Peters (email@example.com) wrote:
<No one said bipeds have to walk.>
Why not? What bipeds (aside from this silly impression of bats) hve no
constraints on locomotion?
There are a few birds out there that stand on one leg. Does them make them
monopeds? What constraint aplies to them and any other organism that just
stands there on one leg? Bats don't even stand, they HANG. And the only other
hanging vertebrates that use their feet for locomotion are various arboreal
mammals such as tamanduas, sloths, kinkajous, and some primatiforms, as well as
a few birds. These animals ACTUALLY WALK using their legs, and in the case of
some birds like colies and parrots, can walk upside down (though often using
their beak, so they are kinda tripeds, like kangaroos on occassion).
You still have not argued for any reason why bats being "bipeds" MATTERS,
since all the material reasons to compare bats to other bipeds would be
locomotorally. There is no other animal in ... well ... existence known that
seems to move into flight from a hanging suspensory position, and that theory
has been pretty well debunked for pterosaurs for the numerous terrestrial
features posited for them and the absence of any bat-like aspects to ANY of
<Except when they are inverted.>
In which case they do not locomote.
Jaime A. Headden