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dinosaur prehistoric extinct reptile animal paleontology fossil natural history museum jurassic cretaceous triassic theropod sauropod ankylosaurus stegosaurus triceratops tyrannosaurus rex velociraptor pterodactyl extinction mass extinction climate change asteroid impact volcanism habitat loss hunting overpopulation competition disease parasitism speciation adaptation radiation diversity extant living fossil endangered species conservation paleoecology taphonomy Lagerstätte fossil record evolutionary history