Патагонская савка Oxyura vittata

Fairly common locally on lakes with surrounding reeds and wetlands with open water; spends much time sleeping. The lowland counterpart to the very similar Andean Duck; the two species may occur together in a few places, but Andean Duck is rare in lowlands, where Lake Duck is the default species. Lake Duck has a squarer head and a slightly longer tail than Andean Duck, but male plumages are very similar. Female Lake Duck often has more contrasting and paler markings with pale barring on sides and bolder stripes on the face than Andean Duck.