This swallow flies over open habitats in South America and beyond. Its back is glossy dark blue and its belly white; in Argentina it catches insects over forests and water.
Its back is glossy dark blue and its belly is white. The Argentine account also notes a dark rump and undertail as a clue for distinguishing it from the related Chilean Swallow.
In northwestern Patagonia it is a summer resident, seen alone or in small groups. It catches insects in flight over forest canopy, rocky ground, and water, and perches on dry branches.
An extinction-risk assessment has not been added yet.