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26 Sep 2009 --- Tenontosaurus tilletti Ornithopod Dinosaur known from the Aptian to Albian stages of the Early to Middle Cretaceous sediments of western North America, dating to around 125-105 million years ago, Carbon County, Montana, USA. Museum of the Rockies, Bozeman --- Image by © Gerald & Buff Corsi/Visuals Unlimited/Corbis

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