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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".

And what do bats do...? Do they have any homo- or analogue of the supracoracoideus? (For the upstroke they use the good old deltoid, the muscle we use for the same movement.)