JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Lystrosaurus therapsids, illustration. Lystrosaurus was a herbivorous burrowing animal, varying in size but typically around the size of a pig. It lived in the Late Permian, from around 250 million years ago. Therapsids included the animals that later evolved into mammals.
Model release not required. Property release not required.