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Re: Maniraptor arms?
Date: Sat, 12 May 2007 00:56:08 -0400
thanks for the prompt reply.
On Friday, May 11, 2007, at 10:30 PM, Anthony Docimo wrote:
When a maniraptoran moved its arm, did the two arms move in sync with one
another, each a mirror image of the other? (since it likely wasn't in
sync with the legs, as quadrapeds are)
I got the idea for this question by thinking of how birds fly by flapping
their wings largely in sync with one anther -- opposed to how a primate
can hang by one arm, while eating with the other.
Well, I'm not sure how one would test for arm motion timing,
just a thought -- would there be any difference in the sockets, to tell
the difference between alternating and paired limb movement? ie,
* right rear leg & left fore leg....left rear leg & right fore leg...repeat
* right rear leg & right fore leg....left rear leg & left fore leg....repeat
*right fore leg & left fore leg....left rear leg & right rear leg...repeat
Whether the arms were used in synchrony or out of phase when grabbing for
prey, obstacles, etc. would seem to matter primarily on what the animals
were deploying the arms to do. A predatory stroke would, for example,
probably be synchronous against small prey (grabbing) and asynchronous when
utilized to harm larger animals (slashing blows).
Birds actually do not always deploy their wings in synchrony. They flap in
synchrony under the most common conditions (leaping launches, level
cruising flight, etc)
this is what I had in mind. after all, even giraffes sometimes vary how
they use their legs.
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