Dimetrodon
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|  Dimetrodon grandis skeleton at the National Museum of Natural History | |||||||||||||
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Dimetrodon was a prehistoric reptile from the Permian period (about 309-233 million years ago). It was thought to be a dinosaur with a sail like the Spinosaurus but people later found out that it was a four legged animal. It lived 238 million years ago.
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