Adult Description:
The adult bird exhibits a pale brown back, a gray forehead, and a head and nape with a gray tinge, with gray edging on the wings. The flanks, rump, and tail are white, featuring a black subterminal band. The outer tail feathers lack the black band, while the central tail feathers are edged with brown. The primary coverts and primary feathers are black. The secondary feathers are white. The chin is white. The neck and upper breast are ash-gray, followed by a broad chestnut band across the chest. The underwings, axillaries, and undertail coverts are white. The eyes are yellow. The beak is yellow with a black tip. The legs are yellow or pale brown. The eyelids and the skin around the eyes are yellow.
Measurements:
- Wing: 228 – 245 mm
- Tail: 93 – 112 mm
- Tarsus (leg): 75 – 79 mm
- Bill: 35 – 39 mm
Distribution:
This species is distributed in Siberia, Northern China, Korea, and Japan. It migrates in winter to Southern China, Indochina, Malaysia, Myanmar, and India. In Vietnam, it is present during the winter in Hòa Bình, Hà Đông, Bắc Cạn, and Thừa Thiên.