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Meet The Dinosaurs!

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15 feet long
Permian Era, 300 million years ago
Western North America, Texas

Dimetrodon was a meat-eating ancestor of both mammals and dinosaurs. But itwas built more like a modern reptile with bent legs. What Dimetrodon's big sailwas good for is a mystery. Perhaps it helped to give off heat for the animal since itlived in a hot time for the Earth. Or it was simply a display to show off to mates orscare rivals.

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