in and perch on a nearly horizontal branch about 10 meters away. When the male sees the female, it will suddenly half the interval between notes, uttering several notes in quick succession. As the male flies to the female, he will open his tail like a fan, lower his wings against the branch and mount the female. Adult nightjars have been observed to share incubation duties with the female partner attending the nest throughout the day and the male at night. As their anti-predator behavior, injury-feigning is commonly observed during the nesting stage. Injury-feigning is a behavior that aims to fool predators and lure them away from a nest by pretending to be injured to distract the attention of the predator. Adult nightjars readily flush, which is a distraction ploy to draw the predator's attention on the adult, when approached. After flushing, adults reposition themselves, facing the same way and parallel to the trail, which provides them a larger open area to escape from potential predators. When these behaviors are observed, adults are highly obscure while the eggs are visible. Vocalization The two subspecies of silky-tailed nightjar have significantly different songs. That of A. s. sericocaudatus is "a short tonal gliss connecting the two major pitch peaks ree-o-ree." That of A. s. mengeli "has an almost mournful, undulating doh wheo eeo." Both members of a mated pair sing, usually from a low perch or during low flight, and mostly at dawn and dusk. Status The IUCN has assessed the silky-tailed nightjar as being of Least Concern, though it population is unknown and believed to be decreasing. No immediate threats have been identified. Because "the Atlantic Forest and the Amazon Basin [are] constantly threatened with human development...known populations of the Silky-tailed Nightjar may rapidly decline." References Antrostomus Birds described in 1849 Taxa named by John Cassin Taxonomy articles created by Polbot