Dimetrodon Wasn't a Dinosaur -- So What Was It?

This four-legged prehistoric animal had a bony sail on its back and was probably scaly, but it was more closely to related to mammals than it was to dinosaurs. Learn about Dimetrodon and other synapsids in today's episode of BrainStuff, based on this article: https://animals.howstuffworks.com/extinct-animals/dimetrodon.htm

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