In 1912, a medium-sized hadrosaur, or duck-billed dinosaur, was described and named Prosaurolophus by Barnum Brown. This animal lived about 75 million years ago on the North American Continent.
Prosaurolophus used its powerful hind legs to walk bipedally, leaving its front legs and feet to be used in self-defense, and to assist in feeding. Fossilized tracks show that Prosaurolophus could also run on all four legs when needed.
This duckbill did not have the head crest common on many of its close relatives. Instead, a small crest appeared just above its eyes.
Like most duckbills, Prosaurolophus had a toothless bill in the front of its mouth, with teeth located further back in its cheeks.