Swinhoe's Rail

Swinhoe's rail is a rare, very small member of the rail family about which very little is known; at 13 centimetres long it is only about sparrow-sized, with a wing length of 75–81 millimetres. It resembles the slightly larger North American yellow rail, to which it is closely related, and as in that species the largely white secondaries are conspicuous in flight. The upper mandible, 12–14.5 millimetres long, is dark brown and the lower greenish yellow, and the legs and feet are pale brownish flesh-coloured with darker joints and claws. (German Wikipedia, general species account)

There is no sexual dimorphism. The upperparts of adults in breeding plumage are overall dark blackish-brown. The species breeds in southeastern Transbaikalia, the southern Ussuri region and eastern Heilongjiang, and winters in Japan, Korea and southeast China. (German Wikipedia, general species account)