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Re: polarity of bipedality in dinosaurs

Stan Friesen wrote:

>Except that bats don't really have any "excess" fingers - they are
>all used as *part* *of* *the* *wing*. In the protobirds only one finger
>was involved in the wing, the others *were* excess as far as flight
>was concerned.

Close, but no soup for you.  In birds, the whole hand has been fused
together (with the exception of the first digit) through wing
development.  Pterosaurs, OTOH, do support their wing with one finger.

Rob Meyerson
Orphan Vertebrate Paleontologist

"No, your monkey is correct."
        -Slartibartfast; _The Hitchhikers Guide to the Galaxy_