Appearance
This 43–46-centimetre 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 1,500 metres. 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 a green speculum.
Females of all subspecies are somewhat 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.
Naming
The subspecies taxonomy is quite confusing. Males of the southern nominate subspecies, the Chilean torrent duck, have a grey back and blackish underparts with a chestnut belly. Males of the slightly smaller northern subspecies, the Colombian torrent duck, "M. a. colombiana", are paler underneath, with steaked grey-brown underparts. Males of a third subspecies, the Peruvian torrent duck, "M. a. leucogenis", are intermediate but very variable in plumage; some have entirely black underparts. Only males of the Chilean torrent duck have a black 'teardrop' mark beneath the eye. The Peruvian torrent duck is sometimes split into not less than 4 subspecies, but these are more likely simply color variations, as they are not limited to distinct areas.
Status
This is a declining species now 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 to be relatively stable.
Behavior
The male's call is a shrill whistle, and the female's is throatier whistle.References:
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