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Dimetrodon may have looked like a dinosaur but it was a far more ancient creature than that. The dinosaurs were "diapsid" reptiles while Dimetrodon was a "synapsid", a class of animals that includes mammals. Like us, Dimetrodon ("two-measure tooth") had two kinds of teeth that enabled it to both stab and "chew".

Many scientists believe its dorsal sail was used to regulate its body temperature.

Vital Statistics

Name: Dimetrodon (E. C. Case, 1906)
Length: 11 feet (3.5 meters)
Weight: 260 kilograms
Time: 270 million years ago (Early Permian)
Place: Texas, Oklahoma, Europe
Diet: meat-eater (carnivore)

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