Grey-winged Blackbird

The grey-winged blackbird is a large thrush, 28–29 cm long and 88–111 g, found in the mountains of southern and eastern Asia from the Himalayas to northern Vietnam. It lives in the middle altitudes of moist montane forest, mostly at 1,800–2,700 m, occasionally down to 1,200 m in winter and up to 3,300 m in summer. (Wikipedia, general species account)

The sexes differ. Males are black with faint pale fringes on the belly, a broad grey patch on the wing and a bright yellow bill, somewhat like a ring ouzel but more uniformly grey. Females are plain brown with a dull yellow to brownish bill. Both have a narrow eye ring, yellow in males and greyish in females. (Wikipedia, general species account)