This bird lives in lowland wetlands and wet grasslands of South America. Adult males are black, while females have brown upperparts and yellowish underparts.
Adult males are entirely black. Females have gray-brown upperparts and yellow underparts with dark streaks on the flanks. Young males can resemble females.
A breeding study in central Argentina found nests in emergent aquatic vegetation in marshes and flooded grasslands. Females built nests and incubated eggs, while males watched over and defended nests.
An extinction-risk assessment has not been added yet.