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2013 anthro avian beak birch bird black_body black_feathers black_nose blotch canid canine canis claws corvid corvus_(genus)detailed_background feathered_wings feathers feral fluffy forest fur grey_body grey_fur group light_theme male mammal nature nude oscine outside passerine plant raven realistic snow snowing standing tree white_body white_fur wings winter wolf yellow_eyes