Black Swift Cypseloides niger

  • Order: Caprimulgiformes
  • Family: Apodidae
  • Polytypic: 3 subspecies
  • Authors: Carolyn Gunn, Jason Beason, Kim Potter, and M. Webb
Sections

Distribution

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  • Year-round
  • Migration
  • Breeding
  • Non-Breeding
Distribution of the Black Swift
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eBird range map for Black Swift

Generated from eBird observations (Year-Round, 1900-present)

Distribution in the Americas

The Americas

Distribution of the three recognized subspecies of the Black Swift is based on body size, wing chord, and degree of white tipping on ventrum and white frosting on head (Ridgway 1911; Zimmer 1945; Webster 1958; Pyle 1997) with some overlap in these parameters but generally demonstrating increasing size from south to north. However, division into subspecies has not been corroborated by genetic analysis and it is possible the size difference observed is an intraspecific geographic variation in body size following Bergmann’s Rule (Gill 1995) and not true subspeciation.

The breeding ranges for the three currently accepted subspecies are listed below:

Breeding range for Cypseloides niger borealis extends from southeastern Alaska (Kennerly 1857; Armstrong 2008); Alberta and British Columbia, Canada (Beebe 1959); coastal and inland areas of Washington, Oregon, and California; throughout mountainous areas of Utah, Idaho, Montana, Colorado and northern New Mexico (Lowther and Collins 2002; Levad 2007). C. n. borealis documented breeding distribution extends to the southern Mexican states of Oaxaca (Rowley 1966; Binford 1989) and Veracruz (Collins and Landy 1968) but it is possible additional breeding sites may occur in Mexico as this swift also has been observed in the states of Baja California, Durango, Mexico, San Luis Potosi, Tlaxcala (Collins and Landy 1968) and Zacatecas (Webster 1958). Webster, however, indicated that all Mexican birds he observed were C. n. costaricensis, although Mexican birds are closer to C. n. borealis in the restriction of the ventral white markings and lesser extent of white frosting on the head, but closer to C. n. costaricensis in wing and tail lengths, an example of the overlap and confusion about distribution of various subspecies. Friedmann et al. (1950) includes Puebla and Nayarit, Mexico, as breeding sites. There are records of sightings of Black Swift from the Provinces of Saskatchewan (Gollop 1982; Krätzig 2008), and Ontario, Canada (Mackenzie 2008; Richards 2008; Cranford 2010), and Minnesota (A. X. Hertzel personal communication) but no nesting sites have been found.  Van Perlo (2006) distribution maps show the Black Swift as a frequent to uncommon transient in Baja and Sonora, and a frequently to uncommonly observed summer bird along the entire western third of the country south of Sonora.

The breeding range of C. n. costaricensis is considered to be Costa Rica (Marín and Sánchez 1998) but it is migratory and does not winter there (Marín and Stiles 1992). The wintering range of C. n. costaricensis is presumed to be south of the Mexican Isthmus in South America, but no confirmation of this exists (Lowther and Collins 2002). Friedmann et al. (1950) indicate this subspecies is found in the highlands of Central America from the Sierra Madre of Chiapas to Honduras and Costa Rica but makes no reference whether the birds were breeding or migratory. Ridgway (1911) described this subspecies from nine skins collected from the highlands of Costa Rica. Specimens of Black Swifts from Costa Rica were examined as part of a comparison of five species of swifts in that country (Marín and Stiles 1992). It was unclear if these were breeding or migratory birds, but the specimens were collected from 4 May to 28 June at Helechales; two females collected on 1 June each had a single ruptured follicle, one female had a mature follicle, and seven males collected in May and June had enlarged testes (Kiff 1975).

The breeding range for C. n. niger is from Cuba east and south through the West Indies and Antilles. Reports of nests include Dominica, but it is not believed to winter there (Bond 1941; Lowther and Collins 2002). C. n. niger may overwinter in Cuba, Jamaica and Hispaniola, with anecdotal information that this subspecies may winter in Guyana in northern South America (Lowther and Collins 2002). Breeding was confirmed in Cuba in 2009 (Espin and Rivera 2010). Considered a common breeding resident April through September in Guadeloupe, Dominica, and Martinique; and uncommon in Puerto Rico, St. Lucia, and St. Vincent; rare on Montserrat, Barbados, and Grenada (Raffaele et al. 2003). Also migrates infrequently in Virgin Islands and Lesser Antilles (Raffaele et al. 2003).

Migration

Geolocator research in Colorado elucidated migratory paths and wintering areas for three birds, and represents all published information on this subject (Beason et al. 2012).  The following table summarizes this information:

MIGRATION EVENTDATES/DURATION - average and (range)
Departure from Colorado14 September (10-19 Sept)
Arrival at wintering area5 October (28 Sept-12 Oct)
Time spent at wintering area220 days (209-227 days)
Departure from wintering area13 May (9-20 May)
Arrival in Colorado1 June (23 May-18 June)
Duration of southbound migration21 days (18-23 days)
Duration of northbound migration20 days (14-29 days)

The migratory path during fall migration could not be determined from geolocator research because of inaccuracies of the devices near the fall equinox. Spring migration was mapped and indicated a similar route taken by three individuals. The wintering area for these three birds was determined to be almost entirely in the State of Amazonas, Brazil, Winter distribution of Black Swift (C. n. borealis) (from Beason et al. 2013)with some locations in northern Bolivia, eastern Peru, and southern Colombia (Beason et al. 2012). A study is currently under way to determine the wintering areas of C. n. borealis from other portions of North America.
Interestingly, all three swifts appear to have flown over Texas, where no observations of Black Swifts have been previously confirmed. Maps of spring migration also show swifts taking a route over the Pacific Ocean west of Central America and Mexico. This possibility is supported by specimens that landed on research vessels and collected off the coast of Guatemala in 1933 (Davidson 1934) and Chiapas in 1963 (Buchanan and Fierstine 1964). Measurements of the collected specimens identified both as C. n. borealis subspecies. Webster (1958) reported C. n. costaricensis from south-central Mexico that were later measured as C. n. borealis. However, with the southern boundary for C. n. borealis not completely understood, one wonders if these could have been representatives of a nearby breeding population and not migrants from north. The furthest south specimens of Black Swift have been collected is Colombia during fall migration and these birds represent migrant C. n. borealis (Stiles and Negret 1994).
It should be noted that several unpublished observations exist for South America (mostly from professional field guides of the region) for Black Swift (personal communications to J.P. Beason); however, distinguishing C. niger from other Cypseloidine species that occupy the continent makes confirming identification very difficult if not impossible without collecting specimens or trapping birds.

C. n. niger and C. n. costaricensis are thought to be nonmigratory residents, but this is not confirmed. One specimen from Guyana exists for C. n. niger and therefore it is possible that some C. n. niger migrate to South America (Stiles and Negret 1994).

Distribution outside the Americas

Cypseloides niger is exclusively a New World species.

Habitat

Breeding sites of Black Swift include sea coast cliffs, waterfalls, caves and other sites inaccessible to terrestrial predators and where shade, cool temperatures, and high humidity are found (Knorr 1961; Levad et al. 2008; Gunn et al. 2012).

Throughout the range of all subspecies, the main Neotropical habitats are at edges of montane evergreen forest and secondary forest (del Hoyo et al. 1999). C. n. borealis occurs from near sea level in California (Roberson and Collins 2008) up to elevations of 3560 m in Colorado (Levad et al. 2008) and 1200-3000 m in Mexico (Howell and Webb 1995, del Hoyo et al. 1999). An excellent analysis of Black Swift nesting habitat in Idaho was compiled by Dumroese et al. (2001). Collins and Landy (1968) reported a nesting colony in Veracruz, Mexico, within subhumid oak-pine zone at approximately 2774 m. Binford (1989) reported Black Swift breeding habitat in Oaxaca to be pine-oak forests and arid subtropical scrub at elevations of 1524 to 1920 m. Surrounding landscape is primarily Foothill, Montane, and Subalpine Life Zones and Mixed Conifer Forest and forms the base for the aerial plankton upon which the swifts feed. Rowley (1966) reported a Black Swift nest near La Cima, Oaxaca, but did not mention the local habitat.

C. n. costaricensis breeding range in Costa Rica was between 2000-2100 m in montane wet forest life zone. Nests were composed of living mosses and liverworts on mossy, humid walls near a waterfall (Marín and Sánchez 1998). C. n. niger prefers montane forested highlands (del Hoyo et al. 1999; Espín and Rivera 2010) although it has been recorded in the lowlands. Bond (1941) found a colony in dense forest near Laudat, Dominica, but did not give an elevation.

Foraging habitat can be quite different than breeding habitat. Black Swifts are often seen foraging low over bodies of water (Lord 1866; Rathbun 1925; Burleigh 1929; Udvardy 1954) during periods of cloudy, foggy, rainy or stormy weather and low barometric pressure, presumably because their aerial insect prey are found at lower altitudes, as opposed to clear days when thermals may develop to carry the insects higher.

The recently discovered South American wintering range for C. n. borealis is lowland rainforest of closed to open broadleaved evergreen or semi-deciduous forest. It is unknown whether the swifts have roost sites within that habitat or if they maintain an aerial habitat on the wintering grounds (Beason et al. 2012). To our knowledge, only one publication mentions a possible sighting of Black Swift in Amazonas, Brazil (Whittaker and Whittaker 2008) in which large feeding flocks of unidentified all dark Cypseloides sp. were seen near Tefé and south of Carauari in winter.

Historical changes

It is difficult to discern population changes over time due to strenuous access to most nesting colonies, inadequate survey efforts, and lack of longevity of observations at most Black Swift breeding colonies. 
In Colorado, 24 of 25 sites found in the late 1940s and early 1950s have been revisited and the colonies appear to be stable (Levad 2007). However, in California, coastal breeding sites have recently declined significantly (Roberson and Collins 2008). Black Swifts confirmed to be breeding at a site in southeastern Arizona in 1988 can no longer be found (Knorr and Knorr 1989).

Fossil history

Fossils of two swifts from the subfamily Cypseloidinae have been found in France. In 1871, Cypseloides ignotus was described from the early Miocene (Aquitanian) of France, and in 1989, Cypseloides mourerchauvireae was described from the late Eocene (Phosphorites du Quercy) of France (Mlíkovský 1989). This subfamily may represent the most primitive group of modern swifts. Although these records were found in the Old World, all extant species of Cypseloidinae occur only in the New World.

Recommended Citation

Gunn, C., J. P. Beason, K. Potter, and M. Webb (2013). Black Swift (Cypseloides niger), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.blkswi.01