Ceratopsians are a group of herbivorous dinosaurs with horns and frills. The most famous is Tricerotops and, most probily, Styracosaurus. Many artifacts show them, including The Inca Burial Stones, which include a man riding a Tricerotops. Sightings include Emela Ntouka, thought to be a Centrosaurus, and Ngoubou, thought to be a Styracosaurus.