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Sickle-winged Nightjar is largely confined to southeastern South America, in Argentina, Brazil, and Paraguay, although its distribution is not well known, and a few records from farther north in Brazil hint at a wider range than currently is generally attributed to the species. This nightjar is small and principally gray brown, with distinctive black scapular spotting, an indistinct buff collar on the neck, and a unique wing shape. Sickle-winged Nighjar is a poorly known species; even its habitat preferences are to some extent disputed, although it probably prefers grassland and marshy edges. Sickle-winged Nightjar currently is treated as Near Threatened according to IUCN threat criteria.