The Southern Rough-winged Swallow is a widespread aerial insectivore of southern Central America and much of South America. It nests in burrows in banks, often near water, and is typically found near water when foraging as well. Overall it is dusky brown with a pale rump and rusty throat and a pale yellowish belly, though western birds are less yellow below and have a whiter rump. In 1981, Northern Rough-winged Swallow and Southern Rough-winged Swallow were described as separate species; the Northern is much drabber overall, but identification is a serious concern and identification should be considered carefully on extralimital or unseasonal records. Southern Rough-winged Swallow is often found in flocks, and can be readily detected by its rising, buzzy bjzjeet calls.