Dimetrodon

A Pelycosaur, it lived during the Permian Period, its name mean 'two types of teeth' it is a distant ancestor of mammals, it had a sail on its back that was most likely used to look larger, to mate, and/or to regulate its body temperature faster, so it could get out of its groggy state faster, letting it be the top dog by eating less awake, warm, and focused pelycosaurs and other life-forms

Torchy from the show 'Land of the Lost' was a fire-breathing Dimetrodon

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