Dimetrodon

Dimetrodon

Though commonly grouped with dinosaurs in children’s books and other media, the Dimetrodon was actually a synapsid, not a dinosaur. Synapsids are a group of animals that includes all mammals, as well as early mammal-like reptiles such as Dimetrodon.The large spiny sail on its back is its most distinctive feature, though its exact function remains unknown.
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