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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.

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)