Dimetrodon
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| Dimetrodon Fossil range: Late Permian |
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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.
