Pachycephalosaurus, a biped dinosaur from the Cretaceous Period.

ANATOMY: SKULL • ANIMAL BODY • ANIMAL HEAD • ANIMAL THEMES • ANIMAL • ARTWORK • BIPED • CLAW • CLAWS • COLOR IMAGE • COPY SPACE • CRANEO • CRANEOS • CRANIUM • CRANIUMS • CRETACEOUS • CROWN • CUTOUT • DIGITALLY GENERATED IMAGE • DINOSAUR • DINOSAURS • EVOLUTION • EXTINCT • FULL LENGTH • GREEN • HERBIVORE • HORIZONTAL • HORNED • ILLUSTRATION • LARGE • LATERAL VIEW • MESOZOIC ERA • NATURAL HISTORY • NATURAL SCIENCES • NATURE STUDY • NO PEOPLE • OMNIVORE • ONE ANIMAL • ORNITHISCHIA • PACHYCEPHALOSAURID • PACHYCEPHALOSAURUS WYOMINGENSIS • PACHYCEPHALOSAURUS • PALAEONTOLOGY • PALAEOZOOLOGY • PALEOART • PALEOBIOLOGY • PALEONTOLOGY • PALEOZOOLOGY • PAST • POWERFUL • PREHISTORIC ERA • PRIMITIVE • REPTIL • REPTILE • REPTILES • SAUROPSID • SCIENCE: EVOLUTION • SIDE VIEW • SKULL • SKULL, ANATOMY • SKULLS • SPECIES • SPIKED • STANDING • STYGIMOLOCH • TALON • TOUGHNESS • UGLINESS • VERTEBRATE • WHITE BACKGROUND • WILDLIFE • WITHOUT PEOPLE • ZOOLOGY