Family Ducks, Geese, Swans (Anatidae)

Least Concern

Chiloe Wigeon (Mareca sibilatrix)


French: Canard de Chiloé German: Chilepfeifente Spanish: Silbón overo

Anas sibilatrix


, 1829,

Talcahuano, Concepción, Chile


Normally placed in Anas. Closely related to M. penelope and M. americana (see M. penelope). Monotypic.


South America S of C Argentina and C Chile; Falkland Is. Winters to S Paraguay and SE Brazil.

Descriptive notes

43–54 cm; 720–1085 g. Compact, heavier than other wigeons, with only slight sexual dimorphism. Flank colour variable. Male has no eclipse plumage: forehead... read more


Very vocal, even at night, with male giving loud, bisyllabic, whistled “rakoo”, which may be... read more


Shallow freshwater lakes, marshes, lagoons and slow-flowing streams or rivers surrounded by... read more

Food and feeding

Essentially vegetarian; grasses, sedges and greener parts of plants and aquatic vegetation, as well as their seeds, but worms, larvae and... read more


Starts Aug/Sept, with courtship noted as early as Jul in Argentina and Jun–Jul in Chile; season generally Dec–Feb in Argentina... read more


Southernmost breeding populations move to lower latitudes in winter, as far N as Uruguay and S... read more

Status and conservation

Not globally threatened (Least Concern). Widely distributed and fairly common in most of range, with an overall population estimated at 100,000–1,000,000 individuals.... read more

Recommended citation

Carboneras, C. & Kirwan, G.M. (2019). Chiloe Wigeon (Mareca sibilatrix). 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 18 November 2019).