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1:1 anthro bottomwear butt clothed clothing clothing_lift echidna feet female fourssss grey_background hi_res humanoid_feet kneeling looking_at_viewer mammal monochrome monotreme plantigrade presenting presenting_hindquarters rear_view sega simple_background skirt skirt_lift solo sonic_adventure sonic_the_hedgehog_(series)tail tail_under_skirt tikal_the_echidna