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Re: evolution of theropod wrist motion



> In a message dated 11/19/01 8:46:34 PM EST, jnorton@une.edu writes:
>
> If the BCF folks are correct, and theropod dinosaurs are the secondarily
> flightless descendents of early feathered flyers, wouldn't there have been
> enough evolutionary time between the earliest theropods and Deinonychus, for
> example, for theropods to have regained the wrist mobility one would expect
> in a ground-based predator?  Wouldn't the ability to rotate, pronate,
> supinate, adduct and abduct the wrist have been enough of an advantage in
> prey capture to reverse the early flight-stroke adaptations?  Why would the
> limited wrist mobility persist?

If BCF folks are incorrect, then why would _Deinonychus_ even have limited
wrist mobility?

Both models require that limited wrist mobility be somehow advantageous to
a terrestrial animal -- it's not something that BCF alone must explain.

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