Band-winged nightjar

The band-winged nightjar or greater band-winged nightjar (Systellura longirostris) is a species of nightjar in the family Caprimulgidae. It is widespread in South America, where it is found in the Andes, Venezuelan Coastal Range, Santa Marta Mountains, Tepuis, most of Chile, Argentina, Paraguay, Uruguay, and eastern Brazil. It occurs in a wide range of habitats, from the edge of humid montane forests to shrubby semi-deserts and urban rooftops.

Over its large range, there are significant variations in its morphology, but, as suggested by its common name, it always has a distinctive band in the wing (best visible in flight), which is white in the male and buff in the female.

This nightjar has a length that varies from 20 to 27 cm (for Ecuador, 21.5 to 23 cm). The iris, bill, legs, and feet vary from brown to blackish brown. On the upper side, a greyish-brown, blackish-brown, brownish-orange, pale yellowish-brown, and greyish-white coloration can be distinguished. The rear of the neck is from a brownish orange to a yellowish brown. Wing-coverts acquire a greyish-brown coloration accompanied by dense spotted yellowish to greyish brown. Scapulars are blackish brown. In males sometimes white and in females sometimes a yellowish-brown mark around the lower throat.

The belly and flanks become brown or yellowish brown. In flight sights, the male has white marks at the edge of the first four primaries, as well as a white band on the first and fourth rectrices. The female does not possess the white mark on the tail.

The face of the male can be greyish brown with brown marks; the crown and margins of the forehead are greyish white. A yellowish-brown to brownish-orange collar is formed at the edges of the neck. The dorsal side has a dark greyish-brown coloration with some blackish-brown spots. Alula and the edges of the wing-coverts are white. The background of wing-coverts is predominantly brown, spotted yellowish brown with brown spots. Scapulars are blackish brown, with yellowish-brown dots and brown spots. The Primaries 7th-10th and the secondary feathers are brown with a midway white streak; the contour of P6-P1 is yellowish-brown by the edges and brownish orange with small brown marks. Tertiaries feathers are greyish brown with brown dots. The tail is mainly brown; with white marks at the third and fifth rectrices with brownish orange and yellowish brown as contours, usually a 10mm white band is marked across half of the middle-upper inner web, with white dots with yellowish brown at the outer edge over the band in the third and second rectrices. Chin and upper throat yellowish brown, prominent white band at the bottom of the throat. Breast, belly, flanks, and ventral coverts vary from greyish brown or brown to yellowish brown.

Unlike males, females have a yellowish-brown throat; across the 7th-10th primaries, a brownish orange to yellowish brown is denoted and the tail lacks white marks. Juveniles and immatures are similar to the adults but less specked, with a small brownish-orange band narrow at the primary feathers.

Fledglings are born with cryptic plumules that help them blend in with the surrounding ground material to avoid predation. It takes approximately eight days for the coloration of this plumage to start resembling that of the adults. They hatch with their eyes partially opened and stay motionless during the first day. The first flights or short glides begin after the 12th day under the vigilance of an adult (it is not specified if the care is shared by parents or is it just one), and displacement of fledglings increases with time. The weight of the egg is approximately 3.03 g and that of the fledglings 4.63 ± 0.25 g.

The species has a variety of calls. The territorial tone is a high-sharp whistle, seeeeert sweeeert seeeet, constantly repeated every 1 to 3 seconds. Whistles can be heard at dusk or dawn. The flight whistle is usually heard during the breeding season as a high cheet. Females when flushed produce a nasal sound like tchree-ee.