Swan Goose
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Anser cygnoides
Found in Mongolia, Northeast China, and the Russian Far East.
The upperparts are greyish-brown, with thin light fringes to the larger feathers and a maroon hindneck and cap (reaching just below the eye).
The remiges are blackish, as are the entire underwing and the white-tipped rectrices, while the upper- and undertail coverts are white.
A thin white stripe surrounds the bill base.
In flight, the wings appear dark, with no conspicuous pattern.
Juveniles are duller than Adult birds, and lack the white bill base and dark streaks on the underside.
The call is a loud, drawn-out and ascending honking aang.
As a warning call, a similar but more barking honk is given two or three times in short succession.