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alleydragon allosaurid allosauroid allosaurus animated animated_gif black_background claws dinosaur feral finger_claws growth head_crest human male mammal markings nude open_mouth prehistoric_species reptile running saurischian scales scalie sharp_teeth short_playtime simple_background snout snout_growth solo striped_markings stripes tail tail_growth teeth theropod toe_claws tongue transformation