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allosaurid allosauroid allosaurus ambiguous_gender back_spikes beak claws cloud dinosaur disney duo fantasia feral fight head_crest hi_res netchimenrevery open_mouth ornithischian outside plant prehistoric_species reptile saurischian scales scalie sharp_teeth signature spiked_tail spikes spikes_(anatomy)stegosaurian stegosaurus storm tail teeth thagomizer theropod thyreophoran