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What is a Dinosaur?
When Dinosaurs Ruled the Earth
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150 million able ago Fossils found Allosaurus animals Archaeopteryx armor attack best-known dinosaurs biggest meat-eater bird-like dinosaurs birds bony plates Brachiosaurus carnivore Centrosaurus ceratopsians chewing claws Coelophysis complete skeletons Compsognathus Cretaceous period Deinonychus dinosaur age Dinosaur Lifestyle Dinosaur Research discovered eaters Euoplocephalus experts think Fearsome Hunter fossilized remains frill Gallimimus Giganotosaurus hadrosaurs hollow bones Iguanodon large hunters Large numbers large theropods largest Late Cretaceous Late Cretaceous period Late Jurassic period Length lizard long neck lt is thought lts arms lts name means meat-eating theropods Megalosaurus million years ago mouth North America nose horn ornithopods appear pachycephalosaurs palaeontologist Pangaea plant-eating sauropod plants Polacanthus powerful jaws predators probably lived pubis bone reptiles rex lived Saurischia and Ornithischia scavenger scientists believe scientists think sharp teeth skull spikes stegosaur Stegosaurus is famous theropod Height thought that ankylosaurs tiny Torosaurus Triceratops Tyrannosaurus rex Volcanic Eruptions walk the Earth weighed