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2006 animal_genitalia avian avian_butt beak bird cloaca corvid corvus_(genus)crow dierdre_raven feathered_wings feathers female feral genitals greyscale looking_back monochrome nude oscine passerine presenting presenting_cloaca raven rear_view rictal_bristles round_cloaca simple_background solo tail tail_feathers white_background windpaw wings