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Albertosaurus animal ankylosaurs Archaeopteryx backbone Baryonyx became extinct belonged bigger birds body bony Brachiosaurus carnosaurs ceratopsians chevron bones claws Coelophysis Compsognathus Corythosaurus creatures Cretaceous period crocodile cycads defense dino dinosaur age dinosaur called dinosaur remains Dinosaurs lived Diplodocus dragon Earth eggs fast-moving dinosaurs feet foot footprint fossil four legs frill Gideon Mantell group of dinosaurs hadrosaur head Herbivorous hind legs hipbone hooflike horns huge Hypsilophodon ichthyosaurs iguana Iguanodon insects jacket jaw muscles joint living reptiles lizard lower jaw mammals meat eaters meat-eating dinosaurs million years ago narrow neck nests nodules Parasaurolophus plant eaters plant-eating dinosaur plaster plates Polacanthus predators prey probably protected Protoceratops pterosaurs rock sauropod sauropod dinosaur saurs scaly Scelidosaurus shape sharp shown skeleton skin impression skull spines stegosaurs Tail bones tail spike tail vertebra teeth thecodont thumb spike toe bone tooth tough plants treetops Triceratops Tyrannosaurus rex walked