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2018 4_toes ambiguous_gender arms_tied avian balls bdsm beak biped bird black_body black_claws black_scales bondage bound bucket chain claws container digital_media_(artwork)duo eyes_closed falcon falconid falcrus falcrus_(character)feathered_wings feathers feet feral folded_wings genitals grey_balls grey_beak grey_body grey_feathers gryphon hi_res holding_object humanoid legs_tied lying male mythological_avian mythological_creature mythology on_side peregrine_falcon quadruped scales silhouette simple_background sleeping spot_color stable standing tail tail_bondage tail_tied talons toe_claws toes white_background white_body white_feathers wings