Family Ducks, Geese, Swans (Anatidae)

Least Concern

Masked Duck (Nomonyx dominicus)


French: Érismature routoutou German: Maskenruderente Spanish: Malvasía enmascarada

Anas dominica


, 1766,

South America = Santo Domingo ex Brisson


Previously placed in genus Oxyura; now returned to its previous, monotypic genus following phylogenetic study#R, a decision not countered by other studies#R. Monotypic.


From extreme S USA (S Texas), Mexico and West Indies S to NW Peru and, E of Andes, to NE Argentina.

Descriptive notes

30–36 cm; male 359–449 g, female 275–445 g. Most distinctive and smallest member of the Oxyurinae and is more dependent on enclosed waterbodies with very... read more


In display, male makes distinctive “kirri-kirroo-kirri-kirroo kirroo kirroo kirroo” and dull-... read more


Freshwater lakes, pools, swamps, marshes and slow-flowing rivers with abundant emergent and... read more

Food and feeding

Chiefly seeds, roots, tubers and vegetative parts of grasses, sedges and aquatic plants, apparently mainly smartweeds and wild millet, at... read more


Starts Nov/Dec in some regions, especially in S of range, but breeding probably occurs year-round throughout distribution, with peak in Jun... read more


Mostly sedentary, but subject to some wide-ranging dispersive or nomadic movements when it may... read more

Status and conservation

Not globally threatened (Least Concern). Widespread and rather uncommon, with overall numbers estimated at 25,000–100,000 individuals in late 1990s but no information... read more

Recommended citation

Carboneras, C. & Kirwan, G.M. (2019). Masked Duck (Nomonyx dominicus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 14 December 2019).