White-winged Swallow Tachycineta albiventer

The White-winged Swallow is a familiar sight over rivers through much of eastern South America, south to southern Brazil and northeastern Argentina. It often is found in pairs or in small groups, of up to a dozen or so individuals, that perch on snags in rivers and lakes. It's flight is low over the water. White-winged Swallows are resident throughout most of its range, but it is a partial austral migrant: in southernmost Brazil, White-winged Swallows are present only during the austral summer.