Torrent duck

M. a. colombiana (Des Murs, 1845) Colombian torrent duck

M. a. leucogenis (Tschudi, 1843) Peruvian torrent duck

M. a. armata (Gould, 1842) Chilean torrent duck

M. a. berlepschi (Hartert, 1909) (disputed)

M. a. garleppi (Berlepsch, 1894) (disputed)

M. a. turneri (Sclater & Salvin, 1869) (disputed)

The torrent duck (Merganetta armata) is a member of the duck, goose and swan family Anatidae. It is the only member of the genus Merganetta. It is placed in the shelduck subfamily Tadorninae after the "perching duck" assemblage to which it was formerly assigned was dissolved because it turned out to be paraphyletic.

This 43 - long species is a resident breeder in the Andes of South America, nesting in small waterside caves and other sheltered spots. Like the blue duck, it holds territories on fast-flowing mountain rivers, usually above 1500 m. It is a powerful swimmer and diver even in white water but is reluctant to fly more than short distances. It is not particularly wary when located.

Male torrent ducks have a striking black and white head and neck pattern and a red bill. In-flight, they show dark wings with green speculum. Females of all subspecies are smaller than the drakes; they have orange underparts and throat, with the head and upperparts grey and a yellower bill. Juveniles are pale grey above and whitish below.

The male's call is a shrill whistle, while the female's is a throatier whistle.

This is a declining species due to competition for its invertebrate food from introduced trout, pollution, forest destruction, and damming of mountain rivers for hydroelectric schemes. The Chilean population seems relatively stable, while the more northern ones are more seriously affected. However, the overall population is still large enough to warrant classification as a Species of Least Concern in the IUCN Redlist.