Pterosaur (TAIR-oh-sore)

Painting of two flying pterosaurs, seen from below.  Clawed hands extend from the leading edge of the wings.

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Pterosaurs were flying reptiles -- not birds or flying dinosaurs -- whose wings were formed from flaps of skin, muscle, and other tissue. The wings stretched between the legs, trunk, arms, and a very long fourth finger. Their distinctive foot and hand prints are preserved in rocks near Washington D.C., showing that they lived here during the Cretaceous.