Description: Vegetarian, lived about 70 million years ago in America
Belonging Order: Diapsid, Ornithischia Pachycephasauria, Pachycephalosauridae
Period: Beginning of Cretaceous Period, about 70-65 million years ago
Distribution: North America
Physical Characteristics: Two-footed dinosaur, with a very thick skullcap endowed with bone nodules behind, jawbone and lower jaw with a horny beak. Short trunk with a stiff spinal column, short muscular posterior limbs and a stiff tail used as a rocker arm during movements.
Extended Description: its particularly shaped head was probably used during duels between males to give powerful head butts. These dinosaurs were probably gregarious and duels had the purpose of establishing the rank inside the group or conquering females.