CERATOPS The "horned faced" Triceratops and Torosaurus are often pictured in a fight with a Tyrannosaurus rex. Fossils of these dinosaurs have been found from Mexico to Canada in North America. They do not appear to have lived on the other continents. Fossils of the "horned faced" dinosaurs measure from 5 to 30 feet in length. A Triceratops would have been a very powerful animal. It would have been able to defend itself with its long horns and powerful body. The "horned faced" dinosaurs were ornithischian plant eaters which lived in the Cretaceous Era.