evolution of triceratops into years. baby, young and adult triceratops on white background

ancient animal antique baby background biology black bone ceratopsid cretaceous cute dino dinosaur ecology egg eggs engraved engraving etching extinct family fossil head herbivore historic history horn isolated jurassic key mother old paleontology picture protoceratops science skeleton skull son species strong styracosaur sweet triassic triceratops vintage white wild wildlife zoology