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50 million Age of Dinosaurs Alberta amphibians animal evolved animal looked animal that lays animal that lives animals and plants animals today archosaurs backbone backdrop body temperature Books About Dinosaurs call dinosaurs cold-blooded continents control its body Cooksonia crocodiles dinosaur remains Dinosaur State Park Dinosaurs Dinosaurs Dinosaurs Hunting dinosaurs ruled discovered Edward Drinker Cope ferns fins forests evolved fossil skeletons fossilized remains group of reptiles groups of vertebrates habitat group horny skin Horsetails Hunting the Dinosaurs ichthyosaur Iguanodon Jane Burton Jurassic Kill the Dinosaurs land late Triassic period lizard lizard-hipped mammals Mantell meteor strike million years ago million years old Minnesota Denver mold Mongolia mounted skeleton move Museum of Natural Natural History North America Ornithischia Othniel Charles Marsh paleobotany paleogeography Paleontologists plant or animal plants evolved Prehistoric Animals prehistoric reptiles pterosaur RECONSTRUCTIONS AND RESTORATIONS restoration shows ruled the Earth Saurischia scientists suggested streamlined bodies Struthiomimus Styracosaurus teeth for eating Tyrannosaurus