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2016 4_toes ambiguous_gender anatid anisodactyl anseriform anserine anthro avian avian_feet bird boo3 breasts cock_transformation conjoined feet female fur genitals herm hi_res intersex male maleherm mammal merging monochrome muscular mustelid mute_swan nipples otter penile_breasts penis sentient_penis swan teeth toes transformation vein veiny_penis vulva whiskers