einiosaurus dinosaurs

america animal armor armored behemoth bird carnivore carnivorous ceratopsian ceratopsid claw creature cretaceous dinosaur einiosaurus environment era evolution extinct extinction feathers flight flying frill herbivore herbivorous horn illustration image lizard mesozoic montana nature neck north northropi paleoart picture powerful prehistoric prey primeval primitive procurvicornis pterodactyl pterodactyloid pterosaur quadruped quetzalcoatlus reptile themes vertebrate wilderness wildlife wing