Other Names: Bimaculate Duck, Squawk Duck
Distribution: throughout Siberia in summer, Japan, South Korea, and southeast China in winter; occasionally found in Alaska.
Size: 39-43 cm in length with a 55-60 cm wingspan; weight of 450-500g.
Plumage: Males have distinctive head coloration, with a dark green nape and dark brown crown separated by a thin bright white stripe, and a yellow face and throat separated by a black vertical eyestripe. Their breast is light brown with dark brown spots, and their gray flanks are set off by white bars on both ends.
Females and juvenile males lack the green nape coloration, possessing a uniformly dark brown cap instead. The striking gray flanks of the adult males are a more muted gray on the females, and possess teh same dark spots as on the breast. Both sexes have black eyes and a black beak.