DIET
Pachycephalosaurus was an herbivore, eating soft plants, fruit, and seeds. Its teeth were small and sharp.

LOCOMOTION
Pachycephalosaurus walked on two legs, and was not a very fast dinosaur. When it walked or ran, it probably held its back level to the ground. It may have gone on all fours to forage for low-lying plants.

DISCOVERY OF FOSSILS
Pachycephalosaurus was discovered in 1938 by William Winkley on the family ranch outside of Ekalaka, Montana, USA. It was named Pachycephalosaurus in 1943 by Barnum Brown and Erich M. Schlaikjer. Although complete fossils are rare, many thick skull fragments have been found. Pachycephalosaurus and other pachycephalosaur fossils have been found in Alberta, Canada, the western United States, the Isle of Wight, Mongolia and Madagascar.

CLASSIFICATION
Pachycephalosaurus belonged to the:

• Order Ornithischia dinosaur - bird-hipped, herbivorous dinosaurs
• Marginocephalia
• Suborder Pachycephalosauria - thick-skulled herbivores (possibly herding) which includes: Pachycephalosaurus, Stegoceras, Wannanosaurus, and others.
• Genus Pachycephalosaurus
• Type species - P. wyomingensis (Gilmore, 1931) (previously known as Troodon).

PACHYCEPHALOSAURUS ACTIVITIES

• A Pachycephalosaurus printout
• Print out a K-3 level Pachycephalosaurus info page to color!
• A first-grade level Pachycephalosaurus addition activity print-out.