wings compared


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forelimb skeletons


generalised pterosaur wing

pterosaur - a flying dinosaur, now extinct. The wing was a membrane supported by the bony skeleton of the arm, forearm, and hand


bird - the bones of the hand support the primary feathers and the bones of the forearm support the secondaries. A small alula is supported by the 'thumb'


bat - an elastic membrane is supported by the skeletal elements. The long slender digits are distinctive


human1.gif (14806 bytes)

human - forelimb skeleton for comparison


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