Eleothreptus anomalus

The sickle-winged nightjar (Eleothreptus anomalus) is a species of nightjar in a monotypic genus in the family Caprimulgidae. It is found in Argentina, Brazil, Paraguay and far northwestern Uruguay. Its natural habitats are subtropical or tropical moist lowland forests, dry savanna, moist savanna, and swamps. It is becoming rare due to habitat loss.