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The chimney swift (Chaetura pelagica) is a bird belonging to the swift family Apodidae. A member of the genus Chaetura, it is closely related to both Vaux's swift and Chapman's swift; in the past, the three were sometimes considered to be conspecific. It has no subspecies. The chimney swift is a medium-sized, sooty gray bird with very long, slender wings and very short legs. Like all swifts, it is incapable of perching, and can only cling vertically to surfaces. Many fly around all day and only come down at night when roosting.

The chimney swift feeds primarily on flying insects, but also on airborne spiders. It generally mates for life. It builds a bracket nest of twigs and saliva stuck to a vertical surface, which is almost always a human-built structure, typically a chimney. The female lays 4–5 white eggs. The altricial young hatch after 19 days and fledge a month later. The average chimney swift lives 4.6 years.

Taxonomy and systematics

When Carl Linnaeus first described the chimney swift in 1758, he named it Hirundo pelagica, believing it to be a swallow.[2] This misconception continued well into the 1800s, with ornithologists calling it "American Swallow" (e.g. Mark Catesby)[4] or "Chimney Swallow" (e.g. John James Audubon).[5] In 1825, James Francis Stephens moved this and other small, short-tailed New World swifts to the genus Chaetura, where it has since remained, although some authorities in the 1800s assigned it to a variety of now obsolete genera.[6] It has no subspecies.[7] The chimney swift's closest relative is Vaux's swift. Scientists believe that the two species evolved from a common ancestor that was forced to North America's southeastern and southwestern corners by glacial advances. Separated for millennia by vast ice sheets, the survivors evolved into two species which are still separated by a wide gap across the continent's midsection.[8] It is also closely related to the Chapman's swift; in the past, the three were sometimes treated as a single species.[9]

The chimney swift's genus name, Chaetura, is a combination of two Ancient Greek words: chaite, which means "bristle" or "spine", and oura which means "tail". This is an apt description of the bird's tail, as the shafts of all ten tail feathers (rectrices) end in sharp, protruding points.[10] The specific name pelagica is derived from the Greek word pelagikos, which means "of the sea".[11] This is thought to be a reference to its nomadic lifestyle rather than to any reference to the sea,[12] a theory strengthened by the later assignment of the specific name pelasgia (after the nomadic Pelasgi tribe of ancient Greece) to the same species by other ornithologists.[11] Its common name refers to its preferred nesting site and its speedy flight.[13]


This is a medium-sized swift, measuring from 12 to 15 cm (4.7 to 5.9 in) in length,[nb 1] with a wingspan of 27 to 30 cm (11 to 12 in) and a weight ranging from 17 to 30 g (0.60 to 1.06 oz).[15] The sexes are identical in plumage,[16] though males average slightly heavier than females.[16] The adult's plumage is a dark sooty olive above and grayish brown below, with a slightly paler rump and uppertail covert feathers, and a significantly paler throat.[17] Its upperparts are the most uniformly colored of all the Chaetura swifts, showing little contrast between back and rump.[18] Its beak is black, as are its feet and legs. Its iris is dark brown.[19] Juvenal plumage (that held by juvenile birds) is very similar to that of adults, but with whitish tips to the outer webs of the secondaries and tertials.[20]

The chimney swift's wings are slender, curved and long,[21] extending as much as 1.5 in (3.8 cm) beyond the bird's tail when folded.[22] Its wingtips are pointed, which helps to decrease air turbulence (and therefore drag) during flight.[23] Its humerus (the bone in the inner part of the wing) is quite short, while the bones farther out (more distally) along the wing are elongated, a combination which allows the bird to flap very quickly.[24] In flight, it holds its wings stiffly, alternating between rapid, quivering flaps and longer glides. Its flight profile is widely described as a "cigar with wings"—a description first used by Roger Tory Peterson.[21] Although the bird often appears to beat its wings asynchronously during flight, photographic and stroboscopic studies have shown that it beats them in unison. The illusion that it does otherwise is heightened by its very fast and highly erratic flight, with many rapid changes of direction.[25]

The legs of the chimney swift, like those of all swifts, are very short.[26] Its feet are small but strong, with very short toes that are tipped with sharp, curved claws.[24] The toes are anisodactyl—three forward, one back—like those of most birds, but the chimney swift can swivel its back toe (its hallux) forward to help it get a better grip. Unlike the legs and feet of most birds, those of the chimney swift have no scales; instead, they are covered with smooth skin.[10]

Its tail is short and square,[27] measuring only 4.8 to 5.5 cm (1.90 to 2.15 in) in length.[19] All ten of its tail feathers have shafts which extend as much as 1.3 cm (0.5 in) beyond the vanes, ending in sharp, stiff points.[10] These help the bird to prop itself against vertical surfaces.[28]

The chimney swift has large, deep set eyes. These are protected by small patches of coarse, black, bristly feathers, which are located in front of each eye. The swift can change the angle of these feathers, which may help to reduce glare. It is far-sighted and, like some birds of prey, this swift is bifoveal: each eye having both a temporal and a central fovea.[nb 2] These are small depressions in the retina where visual acuity is highest,[29] and help to make its vision especially acute.[30] Like most vertebrates, it is able to focus both eyes at once; however, it is also able to focus a single eye independently.[29]

Its bill is very small, with a culmen that measures a mere 5 mm (0.20 in) in length.[31] However, its gape is huge, extending back below its eyes, and allowing the bird to open its mouth very widely.[32] Unlike many insectivorous birds, it lacks rictal bristles at the base of the beak.[33]

Similar species

The chimney swift looks very much like the closely related Vaux's swift, but is slightly larger, with relatively longer wings and tail, slower wingbeats[34] and a greater tendency to soar.[27] It tends to be darker on the breast and rump than the Vaux's swift, though there is some overlap in plumage coloring.[34] It can be as much as 30 percent heavier than Vaux's swift, and its wings, which are proportionately narrower, show a pronounced bulge in the inner secondaries.[35] The chimney swift is smaller, paler and shorter tailed than the black swift.[34] In Central America, it is most similar to Chapman's swift, but it is paler (matte olive rather than glossy black) and has a stronger contrast between its pale throat and the rest of its underparts than does its more uniformly colored relative.[17]

Distribution and habitat

Chimney swifts, like these in a chimney in Missouri, United States, roost communally when not breeding.

A widespread breeding visitor to much of the eastern half of the United States and the southern reaches of eastern Canada, the chimney swift migrates to South America for the winter. It is a rare summer visitor to the western U.S,[36] and has been recorded as a vagrant in Anguilla, Barbados, Greenland, Jamaica, Portugal, the United Kingdom and the U.S. Virgin Islands.[1] It is found over open country, savanna, wooded slopes and humid forests.[37]

The chimney swift's wintering grounds were only discovered in 1944, when bands from birds banded (ringed) in North America were recovered in Peru.[38] An indigenous Peruvian had been wearing the bands as a necklace.[39]


The chimney swift is a gregarious species, and is seldom seen alone. It generally hunts in groups of two or three, migrates in loose flocks of 6–20, and (once the breeding season is over) sleeps in huge communal roosts of hundreds or thousands of birds.[21] Like all swifts, it is a superb aerialist, and only rarely seen at rest. It drinks on the wing, skimming the surface of the water with its beak.[40] It also bathes on the wing, gliding above the surface of a body of water, briefly smacking its breast into the water, then flying off again, shaking its feathers as it goes.[15] It has been recorded by pilots flying more than a mile above the surface of the earth, including one seen at 7,300 ft (2,200 m).[41] It is incapable of perching upright like most birds do; instead, it clings to vertical surfaces.[34] If it is disturbed while at rest, the chimney swift will clap its wings loudly once or twice against its body; it does this either in place, or while dropping down several feet to a lower location. This behavior can result in a loud "thundering" sound if large roosts of the birds are disturbed. The sound is thought to be the bird's way of scaring away potential predators.[42]


Like all swifts, the chimney swift forages on the wing.[15] Studies have shown that 95 percent of its food items are flying insects, including various species of flies, ants, wasps, bees, whiteflies, aphids, scale insects, stoneflies and mayflies. It also eats airborne spiders drifting on their threads.[40] It is an important predator of pest species such as the red imported fire ant[43] and the clover root curculio.[44] Researchers estimate that a pair of adults provisioning a nest with three youngsters consume the weight equivalent of at least 5000–6000 housefly-sized insects per day.[45] Like many bird species, the chimney swift periodically coughs up pellets composed of indigestible bits of prey items.[46]

During the breeding season, at least half of the chimney swift's forays occur within 0.5 km (0.3 mi) of its nest; however, it ranges up to 6 km (3.7 mi) away.[47] While most of its food is seized following aerial pursuit, some is gleaned from the foliage of trees; the bird hovers near the ends of branches or drops through upper canopy levels.[48] The chimney swift generally flies quite high, though it descends during cold or rainy weather.[49] When feeding, it regularly occurs in small groups, and sometimes hunts with swallows, particularly barn swallows and purple martins;[21] in mixed-species flocks, it is typically among the lower fliers.[31] There is at least one record of a chimney swift attempting to steal a dragonfly from a purple martin, and it has been observed chasing other purple martins.[50] In general, it is a diurnal feeder which remains active into early evening. However, there are records, particularly during migration periods, of chimney swifts feeding well after dark over brightly lit buildings.[51]

The species shows two-weight peaks each year: one at the start of the breeding season, and a higher one shortly before it begins its migration south in the autumn. Its lowest weights are typically recorded during the breeding season, when it also begins a complete molt of its plumage. The chimney swift's weight gain before migration is smaller than that of some passerines, suggesting that it must refuel en route at various stopover points.[52]


Egg, Collection Museum Wiesbaden
The nest is made of small, short twigs glued together with saliva.

The chimney swift is a monogamous breeder which normally mates for life, though a small percentage of birds change partners.[53] Pairs perform display flights together, gliding with their wings upraised in a steep "V", and sometimes rocking from side to side. Breeding birds arrive as early as mid March in the southern U.S., and as late as mid-May in the Canadian provinces.[20]

Before the arrival of European colonists into North America, the chimney swift nested in hollow trees; now, it uses human-built structures almost exclusively.[28] While the occasional nest is still built in a hollow tree (or, exceptionally, in an abandoned woodpecker nest),[54] most are now found inside chimneys, with smaller numbers in airshafts, the dark corners of lightly used buildings, cisterns,[55] or wells.[56] The nest is a shallow bracket made of sticks, which the birds gather in flight, breaking them off trees. The sticks are glued together (and the nest to a vertical surface) with copious amounts of the bird's saliva.[57] During the breeding season, each adult's salivary glands more than double in size, from 7 mm × 2 mm (0.276 in × 0.079 in) in the non-breeding season to 14 mm × 5 mm (0.55 in × 0.20 in) during the breeding season.[16]

Unlike some swift species, which mate in flight, chimney swifts mate while clinging to a vertical surface near their nest.[58] They copulate daily, until the clutch is complete.[59] The female typically lays 4–5 eggs,[57] though clutch sizes range from 2 to 7.[59] The eggs, which are long and elliptical in shape, are moderately glossy, smooth and white, and measure 20 mm × 13 mm (0.79 in × 0.51 in).[57] Each weighs nearly 10 percent of the female's body weight.[59] Incubated by both parents, the eggs hatch after 19 days. Baby chimney swifts are altricial—naked, blind and helpless when they hatch. Fledglings leave the nest after a month.[57]

The average chimney swift's life span is 4.6 years,[60] but one is known to have lived more than 14 years. It was originally banded as an adult, and was recaptured in another banding operation some 12.5 years later.[61]

Predators and parasites

Mississippi kites, peregrine falcons and merlins are raptors that are known to take adult chimney swifts in flight, being among the select few avian hunters fast enough to overtake the appropriately named swift on the wing.[62] Eastern screech-owls have been seen attacking colonies, as have non-avian predators including eastern rat snakes, northern raccoons and tree squirrels. These are most likely to take nestlings but may take some nesting adults as well.[63][64] When disturbed by potential predators (including humans) at the colony, adult chimney swifts slap their wings together after arching back and taking flight, making a very loud noise known either as "booming" or "thunder noises". When disturbed, nestlings make a loud, raspy raah, raah, raah sound. Both sounds seem designed to startle potential predators.[65][66]

The chimney swift carries a number of internal and external parasites. It is the type host for the nematode species Aproctella nuda,[67] the feather mite species Euchineustathia tricapitosetosa,[68] and the biting lice species Dennyus dubius,[69] and is also known to carry the tapeworm species Pseudochoanotaenia collocaliae.[70] Its nest is known to host the Hemiptera species Cimexopsis nyctali, which is similar to the bed bug and can (on rare occasions) become a pest species in houses.[71][72]


The chimney swift has a twittering call, consisting of a rapid series of hard, high-pitched chirps. It sometimes gives single chirps.[34]

Conservation status

Purpose-built towers can provide nesting and roosting locations.

In 2010, the International Union for Conservation of Nature changed the chimney swift's status from least concern to near threatened. In 2018, the IUCN changed the chimney swift's status from near threatened to vulnerable. Although the global population is estimated at 7,700,000, it has declined precipitously across the majority of its range.[1] The causes of population declines are largely unclear, but may be related to the alteration of the insect community due to pesticide use in the early half of the 20th century.[73] In Canada, they were listed as threatened by COSEWIC for several years with a likely future listing as a Schedule 1 species of the Species at Risk Act. In the U.S., the chimney swift is protected by the Migratory Bird Treaty Act of 1918. Neither birds nor nests can be removed from chimneys without a federally-issued permit.[74] Populations may have increased historically with the introduction of chimneys to North America by European settlers, providing plentiful nesting opportunities.[citation needed]

After sudden temperature drops, the chimney swift sometimes hunts low over concrete roads (presumably following insect prey drawn to the warmer road), where collisions with vehicles become more likely.[75] Severe storms, such as hurricanes, encountered during migration can seriously impact the chimney's swift's survival rates. Swifts caught up in 2005's Hurricane Wilma were swept as far north as Atlantic Canada and Western Europe. More than 700 were found dead. The following year, roost counts in the province of Quebec, Canada showed a decrease of 62 percent, and the overall population in the province was halved.[76]

History of observation

In 1899, Mary Day of New Jersey observed a pair of chimney swifts nesting in a chimney, and noted the incubation period was 19 days. The first detailed study of chimney swifts began in 1915 by self-taught ornithologist Althea Sherman in Iowa. She commissioned a 28 foot tall tower, of a similar design to a chimney, with ladders and peep holes installed to facilitate observation. Chimney swifts nested in her tower, and for over fifteen years, she meticulously recorded her observations, filling over 400 pages.[77] Sherman remarked that although the tower had been designed with a limited knowledge of the nesting behaviour of chimney swifts, after many years of observation she believed that the original design was ideal.[78]


  1. ^ By convention, length is measured from the tip of the bill to the tip of the tail on a dead bird (or skin) laid on its back.[14]
  2. ^ For more information, see Anatomy of the eye section in the Bird vision article


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  70. ^ Manter, H. W.; Snyder, Raymond (April 1961). "Pseudochoanotaenia (Cestoda) in a Chimney Swift (Chaetura pelagica) in North America". The Journal of Parasitology. 47 (2): 230. doi:10.2307/3275293. JSTOR 3275293.
  71. ^ Boyd, Elizabeth M. (December 1951). "The External Parasites of Birds: A Review" (PDF). The Wilson Bulletin. 63 (4): 363–369.
  72. ^ Kell, Stephen A.; Hahn, Jeff. "Prevention and control of bed bugs in residences". University of Minnesota Extension. Archived from the original on 28 September 2012. Retrieved 27 September 2012.
  73. ^ Nocera, J; et al. (2012). "Historical pesticide applications coincided with an altered diet of aerially foraging insectivorous chimney swifts". Proceedings of the Royal Society B: Biological Sciences. 279 (1740): 3114–3120. doi:10.1098/rspb.2012.0445. PMC 3385487. PMID 22513860.
  74. ^ "Chimney Swifts: What's in my chimney". Maryland Department of Natural Resources. Archived from the original on 24 June 2015. Retrieved 4 December 2012.
  75. ^ Finnis, R. G. (January 1960). "Road Casualties Among Birds". Bird Study. 7 (1): 21–32. Bibcode:1960BirdS...7...21F. doi:10.1080/00063656009475957.
  76. ^ Dionne, Mark; Maurice, Cėline; Gauthier, Jean; Shaffer, François (December 2008). "Impact of Hurricane Wilma on migrating birds: the case of the Chimney Swift". The Wilson Journal of Ornithology. 120 (4): 784–792. doi:10.1676/07-123.1. S2CID 85862924.
  77. ^ Paul D. Kyle (2005). Chimney Swifts: America's Mysterious Birds Above The Fireplace. Texas A & M University Press.
  78. ^ Althea Sherman (1952). Birds of an Iowa Dooryard. University of Iowa Press.

Cited texts

  • Chantler, Phil (1999a). Swifts: A Guide to the Swifts and Treeswifts of the World (2nd ed.). London, UK: Pica Press. ISBN 978-1-8734-0383-9.

External links

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  • Thumbnail for File:ChimneySwift23.jpg
    Chimney Swift (Chaetura pelagica) from US NPS Source: United States National Park Service, Isle Royale National Park English determination method: SHA-1...
    (250 × 252 (15 KB)) - 10:59, 27 February 2024
  • Thumbnail for File:Chaetura pelagica 1900.jpg
    English Chimney Swift with nest determination method: SHA-1...
    (3,046 × 4,015 (9.47 MB)) - 06:27, 20 February 2024
  • Thumbnail for File:Gantry Plaza td (2019-06-08) 029 - Peninsula Park, Chimney Swift Tower.jpg
    BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Chimney Swift Tower, Peninsula Park, Gantry Plaza State Park, Hunters Point, Queens...
    (3,648 × 5,472 (6.43 MB)) - 02:09, 21 November 2022
  • Thumbnail for File:Gantry Plaza td (2019-05-11) 070 - Peninsula Park, Chimney Swift Tower.jpg
    BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Chimney Swift Tower, Peninsula Park, Gantry Plaza State Park, Hunters Point, Queens...
    (5,472 × 3,648 (8.23 MB)) - 22:23, 21 April 2023
  • Thumbnail for File:Gantry Plaza td (2019-06-08) 028 - Peninsula Park, Chimney Swift Tower.jpg
    BY-SA 4.0 Creative Commons Attribution-Share Alike 4.0 truetrue English Chimney Swift Tower, Peninsula Park, Gantry Plaza State Park, Hunters Point, Queens...
    (5,472 × 3,648 (6.96 MB)) - 02:09, 21 November 2022
  • (Linnaeus, 1758) Vernacular names [edit wikidata 'Chimney Swift'] English: Chimney Swift العربية: سمامة المداخن Kotava: Arzentiok azərbaycanca: Dam...
    649 bytes (230 words) - 13:51, 25 May 2018
  • Thumbnail for File:Chimneyswiftykg.jpg
    to en.wikipedia. 2003-07-20 10:30 Jimfbleak 236×282×8 (30948 bytes) Chimney Swift public domain from English determination method:...
    (236 × 282 (30 KB)) - 11:38, 27 February 2024
  • Bird with parts labeled The Bluebird Phoebe Swallows House Wren Chimney Swift Chickadee White-breasted Nuthatch Song Sparrow Screech Owl Ruby-crowned...
    8 KB (173 words) - 13:40, 27 April 2018
  • Thumbnail for File:The incinerator chimney seen from Swift's Corner, Whitley, Coventry - - 4746908.jpg
    Attribution-Share Alike 2.0 Generic license. Attribution: The incinerator chimney seen from Swift's Corner, Whitley, Coventry by Robin Stott You are free: to share...
    (480 × 640 (73 KB)) - 05:06, 12 May 2023
  • duties as an artist for that agency, and is therefore public domain. Chimney Swift, Chaetura pelagica Northern Mockingbird, Mimus polyglottos Common Nighthawk...
    2 KB (171 words) - 06:56, 10 April 2024
  • Thumbnail for File:Chimney swift (51293511099).jpg
    DescriptionChimney swift (51293511099).jpg Chimney swift Date 19 June 2021, 10:25 Source Chimney swift Author Melissa McMasters from Memphis, TN, United...
    (3,187 × 2,125 (255 KB)) - 17:14, 2 April 2024
  • Thumbnail for File:Chimney swift (51292794426).jpg
    DescriptionChimney swift (51292794426).jpg Chimney swift Date 19 June 2021, 10:25 Source Chimney swift Author Melissa McMasters from Memphis, TN, United...
    (2,476 × 1,651 (164 KB)) - 17:14, 2 April 2024
  • Thumbnail for File:Chimney swift (29593166894).jpg
    DescriptionChimney swift (29593166894).jpg Chimney swift Date 30 September 2016, 09:06 Source Chimney swift Author Melissa McMasters from Memphis, TN,...
    (1,624 × 1,083 (101 KB)) - 12:22, 21 May 2024
  • Thumbnail for File:Chimney swift (cropped).jpg
    DescriptionChimney swift (cropped).jpg Chaetura pelagica. Overhead, Austin. Swifts nest in the chimney of my house every summer. Date 14 April 2008, 18:03:33...
    (493 × 685 (162 KB)) - 11:29, 27 February 2024
  • Thumbnail for File:Chimney Swift (492597756).jpg
    DescriptionChimney Swift (492597756).jpg houston, tx Date 9 May 2007, 22:55 Source chimney swift Author Ed Schipul from Houston, TX, US...
    (3,079 × 2,051 (1.75 MB)) - 11:13, 27 February 2024
  • Thumbnail for File:Chimney swift (26442695023).jpg
    DescriptionChimney swift (26442695023).jpg Fermi Lab, Kane CO Date 15 May 2016, 16:47 Source Chimney swift Author synspectrum...
    (1,181 × 886 (594 KB)) - 13:30, 21 May 2024
  • Thumbnail for File:Chimney swift.jpg
    DescriptionChimney swift.jpg Chaetura pelagica. Overhead, Austin. Swifts nest in the chimney of my house every summer. Date 14 April 2008, 18:03:33 Source...
    (1,400 × 1,002 (498 KB)) - 11:29, 27 February 2024
  • Thumbnail for File:Chimney swift overhead.jpg
    DescriptionChimney swift overhead.jpg Chaetura pelagica English: A Chimney Swift flying in Austin, Texas, USA. Date 12 September 2008, 17:31:59 Source...
    (728 × 637 (241 KB)) - 11:29, 27 February 2024
  • Thumbnail for File:Chimney Swift (26351939181).jpg
    DescriptionChimney Swift (26351939181).jpg Chimney Swift Date 10 April 2016, 09:11 Source IMG_9890 Author Gary Leavens...
    (1,158 × 639 (250 KB)) - 11:13, 27 February 2024
  • Thumbnail for File:Chimney swift (PSF).jpg
    DescriptionChimney swift (PSF).jpg line art drawing of Chimney swift. Source Archives of Pearson Scott Foresman, donated to the Wikimedia Foundation Author...
    (345 × 561 (112 KB)) - 11:29, 27 February 2024
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