Stegoceras

- Pronunciation: steg-OSS-er-us
- Translation: Covered horn, or Horny Roof
- Order: Ornithischia
- Suborder: Marginocephalia
- Infraorder: Pachycephalosauria
- Family: Pachycephalosauridae
- Height: 3.5 feet (1.1 meters)
- Weight: 100 pounds (45.4 kg)
- Length: 6 feet (1.8 meters)
- Period: Late Cretaceous
- Description: Herbivore, Bipedal
- Notes: First discovered in Montana and Alberta, Canada, Stegoceras is the best known of all North American "bone-head"dinosaurs. The relatively large brain of this dinosaur was encasedin a dome of 3 inches (7.6 cm) thick bone divided into two parts.The males had larger and thicker domes than the females. Smallspikes fringed the back of the head. Stegoceras males may havebutted competing males for mating territory but it is unlikely thatthey butted heads as commonly portrayed.