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Pterodactyls any of a number of genera of flying reptiles of the extinct order Pterosauria, from the Jurassic and Cretaceous periods, having a highly reduced tail and teeth, birdlike beak and a wingspan of 3.3 ft or less. Pterosaurs ( winged lizard ) were flying reptiles of the order Pterosauria. Pterosaurs are the earliest vertebrates known to have evolved powered flight.
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