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anthro anus ass_up balls blue_body bovid butt caprine ceratopsian ceratopsid chasmosaurine dewclaw_hooves dinosaur domestic_sheep duo erection facial_horn female genitals green_background half-closed_eyes hooves horn imminent_sex larger_male lying male male/female mammal marginocephalian narrowed_eyes nose_horn on_back ornithischian penis prehistoric_species rear_view reptile scalie sheep shukinhekon simple_background size_difference smaller_female smile teeth triceratops underhoof unguligrade vein vulva