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Re: How did dromaeosaurs use their arms?
In a message dated 5/9/00 7:26:13 AM EST, email@example.com writes:
<< Such a structure would allow the wrist to
fold easily against the forearm, pulling it out of the
way, and allowing sufficient leverage for a powerful
forward "swap" of the hand, to be simplistic. >>
This is the key feature of dromaeosaurid forelimb anatomy that supports the
Greg Paul/BCF thesis that dromaeosaurids are secondarily flightless. There is
virtually no chance that such a specifically winglike forelimb articulation
would have evolved in a grounded cursorial predator. But once it is
understood as a holdover from a common ancestor that used its forelimbs for
flying--and that the forward "swap" of the hand you describe is a relic of
the wing stroke in the flying ancestor--its appearance in dromaeosaurids and
other maniraptoran theropods becomes clear.