Magellan/Upland Goose Chloephaga picta

The Magellan or Upland Goose is not a true goose but a Sheldgoose or Shelduck.
There are two subspecies, the Lesser Magellan (c. p. picta) of Argentina/Chile, shown here, and the Greater Magellan (c. p. leucoptera) of the Falklands and south Atlantic.

The male Magellan Goose is white with black markings (top row) while the female (above) is mainly a ruddy orange colour with close black banding from the neck down.

Male Lesser Magellans from the north of their range have a white breast/belly (as immediately above) and from the south they are closely banded from the neck like the female but black and white. Intermediate range Lesser Magellan males show part white breasted, part banding, as below left and top row. Females always have close banding.

Male and female Magellan/Upland Geese also make different sounds: like some humans, the males whistle and the females cackle.