Rugops primus, a prehistoric era dinosaur.

ANGRY • ANIMAL MOUTH • ANIMAL THEMES • ANIMAL • ARTWORK • BIPED • CARNIVORE • COLOR IMAGE • COLOUR IMAGE • CREATURE • CRETACEOUS • CUTOUT • DINOSAUR • DINOSAURS • EVOLUTION • EXTINCT • FIERCE • FRONT VIEW • GROWL • HABITAT • HISSING • HORIZONTAL • ILLUSTRATION TECHNIQUE • ILLUSTRATION • JAW • LARGE • LATERAL VIEW • MESOZOIC ERA • MOUTH OPEN • NATURAL HISTORY • NATURAL SCIENCES • NATURE STUDY • NO PEOPLE • OPEN MOUTH • OPEN-MOUTHED • PAINTING • PALAEONTOLOGY • PALAEOZOOLOGY • PALEOBIOLOGY • PALEONTOLOGY • PALEOZOOLOGY • PAST • POWERFUL • PREDATOR • PREHISTORIC ERA • REPTIL • REPTILE • REPTILES • ROARING • RUGOPS PRIMUS • RUGOPS • SCIENCE: EVOLUTION • SIDE VIEW • SNARLING • SPECIES • THEROPOD • TOUGHNESS • TWO ANIMALS • VERTEBRATE • WHITE BACKGROUND • WILDLIFE • WITHOUT PEOPLE • ZOOLOGY