WALTER MYERS / SCIENCE PHOTO LIBRARY WALTER MYERS / SCIENCE PHOTO LIBRARY
Psittacosaurus dinosaur. Computer artwork of a Psittacosaurus about to eat a cycad 130 million years ago during the Jurassic period, in what is now central Asia. All species of Psittacosaurus (of which there were at least ten) were gazelle-sized bipedal herbivores characterized by a high powerful beak on the upper jaw.
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