|Creature type:||Synapsid reptile|
|Locality:||North America, Europe|
Edaphosaurus was the first herbivorous reptile to evolve.
Edaphosaurus was one of the earliest mammal-like reptile, namely a Pelycosaur. Dimetrodon was a carnivourus pelycosaur, and had many similiarities with Edaphosaurus, including a sail fin.
This fin was likely used in attracting a mate, a flashy display to ward off predators and to control its temperature.
Plants aren't easy to digest, but Edaphosaurus evolved a stomach that could cope with such hard material. It also swallowed stones to help the digestion process.