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after_transformation animal_genitalia anus butt dinosaur duo exhibit feral genital_slit genitals hi_res human male mammal mulveyyy penis photographer prehistoric_species presenting presenting_anus presenting_hindquarters raised_tail reptile saurischian scalie size_transformation smile smug species_transformation tail tail_anus tailbutt theropod thick_tail transformation transformation_by_substance tyrannosaurid tyrannosauroid tyrannosaurus tyrannosaurus_rex vivarium zoo_(facility)