Band-winged nightjar

According to one morphological characterization there could be two groupings of subspecies distributed in different regions. The first grouping would be characterized as having a greyish-brown color (lowland regions in middle, east and south of range) and the other subspecies grouping has a blackish-brown coloration (north and west in uplands). All individuals in each group are presumed to vary in coloration and are sexually dimorphic.

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, buff in the female.

This nightjar has a length that varies from 20–27 cm (for Ecuador, 21.5 to 23 cm). The iris, bill, legs and feet vary from a brown to a blackish brown. At 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 with 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. Belly and flanks become brown or yellowish brown. When flight sights, male has a white marks at the edge of the first four primaries, as well with a white band on the first and fourth rectrices. The female does not possess the white mark on the tail.[4]

The face of the male can be greyish brown with brown marks; crown and margins of the forehead are greyish white. A yellowish-brown to brownish-orange collar is formed at the edges of the neck. Dorsal side has dark greyish-brown coloration with some blackish-brown spots. Alula and the edges of the wing-coverts are white. 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. Tail is mainly brown; with white marks at the third and fifth rectrices with brownish orange and yellowish brown as contour, usually a 10mm white band is marked across half of the midd-upper innerweb, with white dots with yellowish brown at the outer edge over the band in 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 a yellowish brown.[4]

Unlike males, females have a yellowish-brown throat; across the 7th-10th primaries a brownish orange to yellowish brown in denoted and 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.[4]

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 to 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), displacement of fledglings increases with the time. The weight of the egg is approximately 3.03 g and that of the fledglings 4.63 ± 0.25 g.[5]

The band-winged nightjar is a South American species that can be found at elevations of up to 4200 m. Its habitat ranges from the forest edge to semi-arid shrub lands, open areas and even on the roof of buildings. They are mainly nocturnal birds. They roost in a variety of environments from the forest floor to buildings. In Rio de Janeiro, band-winged nightjars have shown a behavioural plasticity, as they roost near sources of light in order to eat the insects that are attracted there.[6]