Ánsar cisnal Anser cygnoides

Large, slender-necked goose typically found in inland areas with expansive wetlands, fields, and lakes. Gathers in large flocks during migration and on its wintering grounds, sometimes mixed with other waterfowl. The bicolored head and neck, dark brown above and tan below, and long dark bill distinguish this species from other geese in its range. Domestic forms (sometimes called “Chinese geese”) vary in plumage from all white to mottled to brown; most have a large bulb above the bill that is not found on wild birds and have stockier bodies and necks.