The Giant Cowbird ranges from southern Mexico to northern Argentina. Males are black with a violet sheen, while females are dark brown. It lays eggs in other birds' nests, leaving them to raise its young.
Males are black with a violet sheen and a more conspicuous neck ruff; females are dark brown to black.
It forages in flocks in forest edges, open woodland, and cultivated areas, eating arthropods, fruit, and nectar. It also lays eggs in other birds' nests.
An extinction-risk assessment has not been added yet.