The Cathetosaurus lived in North America during the Upper Jurassic Epoch. It roamed the United States more than 93 million years ago. Cathetosaurus dwelled in a large river biome. More than 120 different Cathetosaurus specimens have been discovered since 1988.
Characterized by its long neck and large snout, the Cathetosaurus walked on all four legs and ate a plant-based diet. These large creatures weighed up to twenty thousand pounds. Even though their skulls were large and their limbs were short, their bodies seemed to balance well. Based on Cathetosaurus fossils that have been discovered by paleontologists, it appears that they reproduce by laying eggs.