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dinosaur prehistoric illustration jurassic cretaceous extinct biology paleontology evolution natural history fossils skeletons feathers skin eggs nests young growth behavior habitat diet predators prey extinction mass extinction asteroid impact climate change volcanism disease competition human activity conservation paleoecology paleogeography paleoclimatology dinosaurs in popular culture dinosaurs in art dinosaurs in literature dinosaurs in film dinosaurs in television dinosaurs in video games dinosaurs in toys dinosaurs in stamps dinosaurs in coins dinosaurs in advertising dinosaurs in education