The Black-headed Duck lives in wetlands and lakes of southern South America. It has an unusual breeding strategy: it lays its eggs in the nests of other waterbirds rather than building its own nest.
The head, back, and wings are black, while the breast and underside are blackish brown. Females are larger than males, and juveniles have a pale line above the eye.
It does not build a nest or incubate its eggs, instead laying them in the nests of other waterbirds. Its chicks can walk and feed for themselves within hours of hatching.
An extinction-risk assessment has not been added yet.