Swan Goose (Anser cygnoides)
The Swan Goose (Anser cygnoides) is a rare large goose with a natural breeding range in inland Mongolia, northernmost China, and southeastern Russia.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. Apart from darker streaks on the belly and flanks, the underside is pale buff, being especially light on the lower head and foreneck which are sharply delimited against the maroon.
Photographed at the Miller Park Zoo