ambiguous_gender ankylosaurian back_spines ceratopsian ceratopsid chasmosaurine claws dinosaur edmontosaurus feral group hadrosaurid marginocephalian nodosaurid nodosaurus ornithischian ornithopod partially_submerged prehistoric_species reptile saurischian sauropod sauropodomorph scales scalie swimming taylor_mccoy theropod thyreophoran triceratops tyrannosaurid tyrannosauroid tyrannosaurus tyrannosaurus_rex
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