Protoceratops is a dinosaur which lived around 71 million years ago during the end of the Mesozoic Period. It was first discovered in Mongolia—in the Gobi Desert—by Roy Chapman in 1922. Later in 1923, W. K. Gregory and Walter Granger described the newly found species. Upon discovery, this dinosaur was almost immediately hailed as the long sought after ancestor of Triceratops. Since that initial discovery, several Protoceratops have been discovered, including one that was preserved with its own footprints in 2011.
Protoceratops is believed to have been the size of a sheep when fully grown, albeit a very heavy sheep. It was approximately 6 to 8 feet long, 3 feet tall and weighed around a ton. It walked on all four legs, had a bird like beak, teeth in its cheek, and a frill that came from the back of its skull. It legs were very short for an animal its size and its feet had 5 toes.