Sickle-winged Nightjar

The sickle-winged nightjar (Eleothreptus anomalus) is a species of nightjar in the family Caprimulgidae. It is found in Argentina, Brazil, Paraguay and possibly Uruguay. == Taxonomy and systematics == The sickle-winged nightjar was described as Amblypterus anomalus which was later lumped into genus Caprimulgus. Since the early 2010s it has been placed in its current genus Eleothreptus, which it shares with the white-winged nightjar (E. candicans). It is monotypic. == Description == The sickle-winged nightjar is 18 to 20 cm (7.1 to 7.9 in) long; one male weighed 43.7 g (1.5 oz). The adult male's upperparts are grayish brown spotted with dark shades of brown. The wings have a hooked "sickle" appearance due to the shape of the primary flight feathers. They are generally grayish brown, with blackish brown, cinnamon, and white markings. The chin is buffish white with brown bars; the throat brown with a cinnamon tinge, brown bars, and buffy streaks; the breast brown with buff spots and streaks; and the belly and flanks pale buff with brown bars. The adult female is browner than the male and does not have the modified primaries. The pattern and shades of the spots and bars are somewhat different as well.…