Merganetta is a genus of waterfowl belonging to the family Anatidae, which includes small and distinctively shaped ducks commonly known as crested ducks. The genus consists of two species, Merganetta armata and Merganetta leucogenis, native to different regions of South America.
Crested ducks are known for their unique appearance, characterized by a prominent crest of long feathers extending backward from the head. Merganetta armata, also known as the torrent duck, is primarily found in fast-moving mountain streams and rivers of the Andes range, spanning from Ecuador to Tierra del Fuego. This species is adapted to its habitat with strong claws, well-developed webs, and a specialized beak for foraging in turbulent waters.
Merganetta leucogenis, commonly referred to as the white-headed duck, inhabits lowland rivers and lakes in the southern Andes, particularly in Argentina and Chile. This species exhibits a white head, as the name suggests, contrasting with the chestnut-brown body. It is believed to be less adapted to fast-moving waters compared to M. armata.
Both species of merganetta ducks are known for their distinct vocalizations, which include various calls and whistling notes. They primarily feed on aquatic invertebrates such as insects, crustaceans, and mollusks, obtained by diving underwater or grazing along the riverbanks.
The genus Merganetta showcases the diversity of specialized waterfowl species adapted to particular watery habitats in South America and contributes to the rich biodiversity of the region.
