This blackbird occurs around lakes and lagoons in Argentina. Males are black and may show brown flecking in spring; females are streaked brown. A yellow shoulder stands out in flight.
Males are black and may have brown flecking in spring. Their yellow shoulder is conspicuous in flight. Females are brown with black streaks and a white eyebrow.
In Argentina, the species uses reedbeds and shoreline vegetation around lakes and lagoons. It feeds mainly on insects and also takes seeds.
An extinction-risk assessment has not been added yet.