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Re: Dinosaurs and birds



Scott, would you elaborate a bit on the two quoted points, please? I note in passing that pterosaurs don't have "a pulley-like supracoracoideus needed to prevent dislocation of the humerus during downstrokes". Is a pulley-like supracoracoideus absolutely required for flight?
Thanks,
Jim


----- Original Message ----- From: <dinoboygraphics@aol.com>
To: <twilliams_alpha@hotmail.com>; <dinosaur@usc.edu>
Sent: Wednesday, April 04, 2007 9:09 AM
Subject: Re: Dinosaurs and birds



........Outside of the assymetrical feathers (which is a drag-reducing adaptation, not a lift-generating one, although the two are related)

the lack of a pulley-like supracoracoideus needed to prevent dislocation of the humerus during downstrokes,