The Clash of Titans

Permian Texas, 290 million years ago. The early Permian segment of Reptile's Beginnings featured early mammal-like reptiles: Dimetrodon and Edaphosaurus, the sail-backed reptiles. These sails were very efficient heating and cooling devices, able to catch the warming sun rays and the cooling breezes, but the sail-backed reptiles were just side branches of reptiles to mammal evolution.