The Long-winged Harrier is a striking, lanky raptor of South American grasslands. The male has largely black upperparts, a gray tail and gray remiges boldly banded with black, and white facial markings. The light morph has a white belly, while the dark morph is entirely black below. Females are similarly-patterned, with much of the black replaced by brown. This species is found in wet fields, marshes, grasslands, and savanna where it courses low over the grass and drops to the ground to capture mammals, reptiles, amphibians, and birds. Like other harriers, it nests on the ground in grasses. It ranges from central Argentina, where birds are present only during the summer breeding season, through eastern Brazil to the Guianas, Venezuela, and Colombia. Its status in the northern parts of the range is unclear, but breeding has been documented on Trinidad.