Placerias lived during the Triassic Period about 215 million years ago, in North America. It measured 11 feet (3.5 meters) in length. It possessed two tusks in the upper jaw. These tusks show that Placerias was a member of the dicynodont family of mammal-like reptiles. In fully-grown adults the skull was about 2 feet (60 centimeters) in length. It had a bony beak that was used to shear through plant material, from tough roots to soft stems and leaves. Placerias resembled a modern hippopotamus, it had a bulky body, had short legs and wide, blunt claws. It is believed that Placerias lived in herds, close to water. It was one of the last of the dicynodonts, which became extinct about 210 million years ago.