Bay-winged cowbirds are native to central and southern South America, making their homes primarily in the Andean highlands. This species generally is found throughout Argentina, with the westernmost portions of its range abutting the eastern slopes of the Andes. Bay-winged cowbirds may be found in Uruguay, Paraguay, Bolivia, and in the southwestern corner of Brazil. An isolated population of bay-winged cowbirds is found at the mouth of the Amazon River (Jaramillo and Burke 1999).
Biogeographic Regions: neotropical (Native )