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Dinosaurs are a diverse group of animals of the clade Dinosauria. They first appeared during the Triassic period, approximately 250 million years ago, and were the dominant terrestrial vertebrates for 135 million years, from the beginning of the Jurassic (about 200 million years ago) until the end of the Cretaceous (66 million years ago), when the Cretaceous-Paleogene extinction event led to the extinction of most dinosaur groups at the close of the Mesozoic Era. Illustration originally captioned The leaping dinosaurs. by Charles R. Knight, 1897. American Museum of Natural History. This is not a factually accurate dinosaur restoration. Too many fingers, no dewclaw, crocodilian osteoderms. Knight original caption Two Laelaps (Dinosaurs/Dryptosaurus) fighting.
July 30th, 2014
Viewed 1 Time - Last Visitor from Beverly Hills, CA on 10/26/2014 at 12:30 PM
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