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Ichthyornis Niobrara Formation Pteranodon Bird Cretaceous, Skeleton, branch, twig, bird png -
Hell Creek Formation Rocky Mountain Dinosaur Resource Center Late Cretaceous Tyrannosaurus Marsupial, ice age, mammal, heroes, tyrannosaurus png
Rocky Mountain Dinosaur Resource Center Marsupial Hell Creek Formation Lance Formation Late Cretaceous, clean, miscellaneous, mammal, carnivoran png
