A miniature pied duck with a very small black bill. Breeding male has green-black upperparts, white underparts with black cap and breast band and pale grey flanks. Striking white wingbars are visible in flight. Non-breeding plumage resembles the drabber, browner female (also shown) but retain the white wingbars. Habits: Feeds on aquatic vegetation and animals. Engages in aerobatic courtship chases.