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alleydragon animated animated_gif beak biped_to_quadruped black_background claws dinosaur feral finger_claws grey_body grey_scales growth human iguanodon iguanodontian iguanodontid long_tail male mammal mouth_closed nude_male ornithischian ornithopod pawpads prehistoric_species reptile scales scalie short_playtime simple_background snout snout_growth solo tail tan_body tan_scales transformation yellow_eyes