White-winged nightjar

White-winged nightjar
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Clade: Strisores
Order: Caprimulgiformes
Family: Caprimulgidae
Genus: Eleothreptus
Species:
E. candicans
Binomial name
Eleothreptus candicans
(Pelzeln, 1867)

The white-winged nightjar (Eleothreptus candicans) is a species of nightjar in the family Caprimulgidae. It is found in Bolivia, Brazil and Paraguay.[2]

Taxonomy and systematics

The white-winged nightjar, with two other nightjars, was at one time placed in genus Thermochalcis that was later merged into Caprimulgus. Since the early 2010s it has been placed in its current genus Eleothreptus, which it shares with the sickle-winged nightjar (E. anomalus). It is monotypic.[3][4][2]

Description

The white-winged nightjar is 19 to 23 cm (7.5 to 9.1 in) long. Adult males weigh 46 to 55 g (1.6 to 1.9 oz) and females 46 to 55 g (1.6 to 1.9 oz). The adult male's upperparts are pale grayish brown with bold blackish spots on the crown and brown streaks, bars, and speckles on most of the rest. Much of the face is brown, with a white supercilium and "moustache". The breast is grayish brown with a chestnut tinge and brown bars and speckles; the rest of the underparts are white. In flight the male shows whitish wings and a mostly white tail. Adult females have buffy underparts and no white in the plumage. Juveniles are browner rather than grayish.[4][5][6]

Distribution and habitat

The white-winged nightjar is known from widely separated sites in northern Bolivia, south-central Brazil, and eastern Paraguay. There are also historical reports from sites in southern Brazil. It inhabits open grassland with scattered trees and bushes such as savanna and cerrado. In elevation it ranges from sea level to 210 m (690 ft).[4]

Behavior

Movement

The white-winged nightjar might be migratory in at least part of its range.[4]

Feeding

The white-winged nightjar mostly forages in continuous low flight, though it has also been recorded sallying from low perches. Its flight is "typically slow and frequently interspersed by glides". It feeds on insects including beetles and moths.[4]

Breeding

The first white-winged nightjar nest was found in 1997. The clutch of two eggs is laid directly on the ground. In Paraguay egg laying was documented from mid September to mid November. Females alone incubate the eggs. Males make a display flight that shows the white of the wings and tail; the display is apparently both territorial and for mate attraction.[4][6]

Dickcissel male perched on a metal pole singing, with neck stretched and beak open.

Songs and calls
Listen to white-winged nightjar on xeno-canto

Vocalization

Male white-winged nightjars makes a soft territorial call "tshere-she-shew" during chases. Display flights also include mechanical wing noises. The species' alarm call is an abrupt "eek".[4][7]

Status

The IUCN originally assessed the white-winged nightjar as Threatened, then in 1994 as Critically Endangered, and in 2000 as Endangered. Since 2019 it has been rated Vulnerable. It has a very small population and is known from only a few scattered sites. The main threats include conversion of habitat to agriculture (pasture, row crops, and Eucalyptus plantations) and fire.[1]

References

  1. ^ a b BirdLife International (2019). "White-winged Nightjar Eleothreptus candicans". IUCN Red List of Threatened Species. 2019. Retrieved 9 October 2021.
  2. ^ a b Gill, F.; Donsker, D.; Rasmussen, P. (July 2021). "IOC World Bird List (v 11.2)". Retrieved July 14, 2021.
  3. ^ Remsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 24 August 2021. A classification of the bird species of South America. American Ornithological Society. https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm retrieved August 24, 2021
  4. ^ a b c d e f g Cleere, N., G. M. Kirwan, and E. de Juana (2020). White-winged Nightjar (Eleothreptus candicans), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.whwnig1.01 retrieved October 9, 2021
  5. ^ López Lanús, B.; Clay, R.P.; Lowen, J.C. (1998). "A new plumage of the white-winged nightjar Caprimulgus candicans (Aves: Caprimulgidae)". Bulletin of the British Ornithologists' Club. 118 (3): 183–187.
  6. ^ a b Pople, R.G. (2003) The Ecology and Conservation of the White-winged Nightjar Caprimulgus candicans. Ph.D. dissertation, University of Cambridge, UK. Available at: http://www.dspace.cam.ac.uk/handle/1810/225237.
  7. ^ Clay, R.P.; López Lanús, B.; Tobias, J.A.; Lowen, J.C.; Mazar Barnett, J. (2000). "The display of the white-winged nightjar". Journal of Field Ornithology. 71 (4): 619–626. doi:10.1648/0273-8570-71.4.619.