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Contact: Sandra Hines
University of Washington

Prehistoric Dinosauriform Asilisaurus

Caption: Ten million years after the mass extinction, members of the archosaur reptiles -- such as the 10-foot (3 meter) long Asilisaurus pictured -- had more restricted geographic ranges compared to the communities of four-legged animals that existed before the extinction.

Credit: Marlene Donnelly/Field Museum of Natural History

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