|Black-headed Duck (Heteronetta atricapilla)|
|Taim, Rio Grande do Sul, Brazil
This bird is distributed in Southern South America, mainly Chile and Argentina, but is an austral winter migrant to southern Brazil, Uruguay and Bolivia.
|The Black-headed Duck is a brood parasite always laying its eggs in another bird's nest. A common host is the Red-fronted Coot (Fulica rufifrons) . The incubation period for the Black-headed Duck at about 24 days is shorter than that of the host's eggs. When hatched the duckling spends only a few hours in the nest before it is off looking after itself. The brood parasitism of the Black-headed Duck is therefore quite benign given that the host's eggs and young are not damaged and the duckling doesn't even require feeding.|
|There is an illustration in HBW, Volume 1, Page 624.|