Barn swallow

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Barn swallow
Rauchschwalbe Hirundo rustica.jpg
in Tönning, Germany
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Hirundinidae
Genus: Hirundo
Species:
H. rustica
Binomial name
Hirundo rustica
Subspecies

6, see text

HirundoRusticaIUCN.svg
Range of H. rustica
  Breeding
  Resident
  Passage
  Non-breeding
Synonyms
  • Hirundo erythrogaster(Boddaert, 1783)

The barn swallow (Hirundo rustica) is the most widespread species of swallow in the world, occurring on all continents, with vagrants reported even in Antarctica. [2] [3] It is a distinctive passerine bird with blue upperparts and a long, deeply forked tail. In Anglophone Europe, it is just called the swallow; in northern Europe, it is the only member of family Hirundinidae called a "swallow" rather than a "martin".

Contents

There are six subspecies of barn swallow, which breed across the Northern Hemisphere. [2] Two subspecies, (H. r. savignii and H. r. transitiva) have fairly restricted ranges in the Nile valley and eastern Mediterranean, respectively. [2] The other four are more widespread, with winter ranges covering much of the Southern Hemisphere. [4]

The barn swallow is a bird of open country that normally nests in man-made structures and consequently has spread with human expansion. It builds a cup nest from mud pellets in barns or similar structures and feeds on insects caught in flight. [5] This species lives in close association with humans, and its insect-eating habits mean that it is tolerated by humans; this acceptance was reinforced in the past by superstitions regarding the bird and its nest. There are frequent cultural references to the barn swallow in literary and religious works due to both its living in close proximity to humans and its annual migration. The barn swallow is the national bird of Austria and Estonia.

Description

Reported range from observations submitted to eBird shows the migration pattern of the species Year-round range Summer range Winter range Barn Swallow ebird data map.png
Reported range from observations submitted to eBird shows the migration pattern of the species
  Year-round range
  Summer range
  Winter range

The adult male barn swallow of the nominate subspecies H. r. rustica is 17–19 cm (6+1⁄2–7+1⁄2 in) long including 2–7 cm (1–3 in) of elongated outer tail feathers. It has a wingspan of 32–34.5 cm (12+1⁄2–13+1⁄2 in) and weighs 16–22 g (9⁄16–3⁄4 oz). It has steel blue upperparts and a rufous forehead, chin and throat, which are separated from the off-white underparts by a broad dark blue breast band. The outer tail feathers are elongated, giving the distinctive deeply forked "swallow tail". There is a line of white spots across the outer end of the upper tail. [6] The female is similar in appearance to the male, but the tail streamers are shorter, the blue of the upperparts and breast band is less glossy, and the underparts paler. The juvenile is browner and has a paler rufous face and whiter underparts. It also lacks the long tail streamers of the adult. [7]

Although both sexes sing, female song was only recently described. [8] (See below for details about song.) Calls include witt or witt-witt and a loud splee-plink when excited or trying to chase intruders away from the nest. [6] The alarm calls include a sharp siflitt for predators like cats and a flitt-flitt for birds of prey like the hobby. [9] This species is fairly quiet on the wintering grounds. [10]

The distinctive combination of a red face and blue breast band renders the adult barn swallow easy to distinguish from the African Hirundo species and from the welcome swallow (Hirundo neoxena) with which its range overlaps in Australasia. [7] In Africa the short tail streamers of the juvenile barn swallow invite confusion with juvenile red-chested swallow (Hirundo lucida), but the latter has a narrower breast band and more white in the tail. [11]

Taxonomy

The barn swallow was described by Carl Linnaeus in his 1758 10th edition of Systema Naturae as Hirundo rustica, characterised as "H. rectricibus, exceptis duabus intermediis, macula alba notatîs". [12] Hirundo is the Latin word for "swallow"; rusticus means "of the country". [13] This species is the only one of that genus to have a range extending into the Americas, with the majority of Hirundo species being native to Africa. This genus of blue-backed swallows is sometimes called the "barn swallows". [14] [7]

The Oxford English Dictionary dates the English common name "barn swallow" to 1851, [15] though an earlier instance of the collocation in an English-language context is in Gilbert White's popular book The Natural History of Selborne , originally published in 1789:

The swallow, though called the chimney-swallow, by no means builds altogether in chimnies [ sic ], but often within barns and out-houses against the rafters ... In Sweden she builds in barns, and is called ladusvala, the barn-swallow. [16]

Gnome-mime-sound-openclipart.svg
Recording of barn swallows
Song recorded at the Minnesota Valley National Wildlife Refuge
Problems playing this file? See media help.

This suggests that the English name may be a calque on the Swedish term.

There are few taxonomic problems within the genus, but the red-chested swallow—a resident of West Africa, the Congo Basin, and Ethiopia—was formerly treated as a subspecies of barn swallow. The red-chested swallow is slightly smaller than its migratory relative, has a narrower blue breast-band, and (in the adult) has shorter tail streamers. In flight, it looks paler underneath than barn swallow. [11]

Subspecies

Holotype of Chelidon rustica transitiva Hartert (NML-VZ T2057) held at World Museum, National Museums Liverpool NML-VZ T2057 Chelidon rustica transitiva.jpg
Holotype of Chelidon rusticatransitiva Hartert (NML-VZ T2057) held at World Museum, National Museums Liverpool
A European Barn Swallow pauses to rest on a fence post beside a freshwater lake on Lindisfarne.

Six subspecies of barn swallow are generally recognised. In eastern Asia, a number of additional or alternative forms have been proposed, including saturata by Robert Ridgway in 1883, [17] kamtschatica by Benedykt Dybowski in 1883, [18] ambigua by Erwin Stresemann [19] and mandschurica by Wilhelm Meise in 1934. [17] Given the uncertainties over the validity of these forms, [18] [20] this article follows the treatment of Turner and Rose. [7]

The short wings, red belly and incomplete breast band of H. r. tytleri are also found in H. r. erythrogaster, and DNA analyses show that barn swallows from North America colonised the Baikal region of Siberia, a dispersal direction opposite to that for most changes in distribution between North America and Eurasia. [33]

Behaviour

Habitat and range

The preferred habitat of the barn swallow is open country with low vegetation, such as pasture, meadows and farmland, preferably with nearby water. This swallow avoids heavily wooded or precipitous areas and densely built-up locations. The presence of accessible open structures such as barns, stables, or culverts to provide nesting sites, and exposed locations such as wires, roof ridges or bare branches for perching, are also important in the bird's selection of its breeding range. [6]

Barn swallows are semi-colonial, settling in groups from a single pair to a few dozen pairs, particularly in larger wooden structures housing animals. The same individuals often breed at the same site year after year, although settlement choices have been experimentally shown to be predicted by nest availability rather than any characteristics of available mates. [34] Because it takes around 2 weeks for a pair to build a nest from mud, hair, and other materials, old nests are highly prized. [35]

H. r. rustica juveniles Barn swallow (Hirundo rustica rustica) juveniles.jpg
H. r. rustica juveniles
The movement of two swallows in slow motion

This species breeds across the Northern Hemisphere from sea level to 2,700 m (8,900 ft), [36] but to 3,000 m (9,800 ft) in the Caucasus [6] and North America, [37] and it is absent only from deserts and the cold northernmost parts of the continents. Over much of its range, it avoids towns, and in Europe is replaced in urban areas by the house martin. However, in Honshū, Japan, the barn swallow is a more urban bird, with the red-rumped swallow (Cecropis daurica) replacing it as the rural species. [7]

In winter, the barn swallow is cosmopolitan in its choice of habitat, avoiding only dense forests and deserts. [38] It is most common in open, low vegetation habitats, such as savanna and ranch land, and in Venezuela, South Africa and Trinidad and Tobago it is described as being particularly attracted to burnt or harvested sugarcane fields and the waste from the cane. [10] [39] [40] In the absence of suitable roost sites, they may sometimes roost on wires where they are more exposed to predators. [41] Individual birds tend to return to the same wintering locality each year [42] and congregate from a large area to roost in reed beds. [39] These roosts can be extremely large; one in Nigeria had an estimated 1.5 million birds. [43] These roosts are thought to be a protection from predators, and the arrival of roosting birds is synchronised in order to overwhelm predators like African hobbies. The barn swallow has been recorded as breeding in the more temperate parts of its winter range, such as the mountains of Thailand and in central Argentina. [7] [44]

Migration of barn swallows between Britain and South Africa was first established on 23 December 1912 when a bird that had been ringed by James Masefield at a nest in Staffordshire, was found in Natal. [45] As would be expected for a long-distance migrant, this bird has occurred as a vagrant to such distant areas as Hawaii, Bermuda, Greenland, Tristan da Cunha, the Falkland Islands, [7] and even Antarctica. [46]

Feeding

Chicks in the nest Swallow August 2013-2.jpg
Chicks in the nest

The barn swallow is similar in its habits to other aerial insectivores, including other swallow species and the unrelated swifts. It is not a particularly fast flier, with a speed estimated at 11 m/s (40 km/h), up to 20 m/s (72 km/h) and a wing beat rate of approximately 5, up to 7–9 times each second. [47] [48]

The barn swallow typically feeds in open areas [49] 7–8 m (23–26 ft) above shallow water or the ground often following animals, humans or farm machinery to catch disturbed insects, but it will occasionally pick prey items from the water surface, walls and plants. [6] Swallows have been observed feeding on insects that fly around active white stork nests as well. [50] In the breeding areas, large flies make up around 70% of the diet, with aphids also a significant component. However, in Europe, the barn swallow consumes fewer aphids than the house or sand martins. [6] On the wintering grounds, Hymenoptera, especially flying ants, are important food items. [7] Grasshoppers, crickets, dragonflies, beetles and moths are also preyed upon. [51] When egg-laying, barn swallows hunt in pairs, but otherwise will form often large flocks. [7]

The amount of food a clutch will get depends on the size of the clutch, with larger clutches getting more food on average. The timing of a clutch also determines the food given; later broods get food that is smaller in size compared to earlier broods. This is because larger insects are too far away from the nest to be profitable in terms of energy expenditure. [52]

Isotope studies have shown that wintering populations may utilise different feeding habitats, with British breeders feeding mostly over grassland, whereas Swiss birds utilised woodland more. [53] Another study showed that a single population breeding in Denmark actually wintered in two separate areas. [54]

The barn swallow drinks by skimming low over lakes or rivers and scooping up water with its open mouth. [37] This bird bathes in a similar fashion, dipping into the water for an instant while in flight. [42]

Swallows gather in communal roosts after breeding, sometimes thousands strong. Reed beds are regularly favoured, with the birds swirling en masse before swooping low over the reeds. [9] Reed beds are an important source of food prior to and whilst on migration; although the barn swallow is a diurnal migrant that can feed on the wing whilst it travels low over ground or water, the reed beds enable fat deposits to be established or replenished. [55]

Song

Males sing to defend small territories (when living in colonies, less so in solitary pairs) and to attract mates. Males sing throughout the breeding season, from late April into August in many parts of the range. Their song is made up of a "twitter warble," followed by a rising "P-syllable" in European H. r. rustica and the North American H. r. erythrogaster. [56] In all subspecies, this is followed by a short "Q-syllable" and a trilled series of pulses, termed the "rattle." [57] The rattle is sometimes followed by a terminal "Ω-Note" in some subspecies' populations, and always at the end of H. r. tytleri song. [56]

Female songs are much shorter than male songs, and are only produced during the early part of the breeding season. [8] Females sing spontaneously, though infrequently, and will also countersing in response to each other. [8]

Breeding

Swallow eggs, hatched Hirundo rustica MHNT.jpg
Swallow eggs, hatched

The male barn swallow returns to the breeding grounds before the females and selects a nest site, which is then advertised to females with a circling flight and song. [6] Plumage may be used to advertise: in some populations, like in the subspecies H. r. gutturalis, darker ventral plumage in males is associated with higher breeding success. In other populations, [58] the breeding success of the male is related to the length of the tail streamers, with longer streamers being more attractive to the female. [6] [59] Males with longer tail feathers are generally longer-lived and more disease resistant, females thus gaining an indirect fitness benefit from this form of selection, since longer tail feathers indicate a genetically stronger individual which will produce offspring with enhanced vitality. [60] Males in northern Europe have longer tails than those further south, whereas in Spain the male's tail streamers are only 5% longer than the female's; in Finland, the difference is 20%. In Denmark, the average male tail length increased by 9% between 1984 and 2004, but it is possible that climatic changes may lead in the future to shorter tails if summers become hot and dry. [61]

Older chicks in nest Hirundo rustica 14105.JPG
Older chicks in nest

Males with long streamers also have larger white tail spots, and since feather-eating bird lice prefer white feathers, large white tail spots without parasite damage again demonstrate breeding quality; a positive association exists between spot size and the number of offspring produced each season. [62]

The breeding season of the barn swallow is variable: in the southern part of the range, the breeding season usually is from February or March to early to mid September, although some late second and third broods finish in October. In the northern part of the range, it usually starts late May to early June and ends the same time as the breeding season of the southernmost birds. [63]

Both sexes defend the nest, but the male is particularly aggressive and territorial. [7] Once established, pairs stay together to breed for life, but extra-pair copulation is common, making this species genetically polygamous, despite being socially monogamous. [64] Males guard females actively to avoid being cuckolded. [65] Males may use deceptive alarm calls to disrupt extrapair copulation attempts toward their mates. [66]

As its name implies, the barn swallow typically nests inside accessible buildings such as barns and stables, or under bridges and wharves. [67] Before man-made sites became common, it nested on cliff faces or in caves, but this is now rare. [7] The neat cup-shaped nest is placed on a beam or against a suitable vertical projection. It is constructed by both sexes, although more often by the female, with mud pellets collected in their beaks and lined with grasses, feathers, algae [67] or other soft materials. [7] The nest building ability of the male is also sexually selected; females will lay more eggs and at an earlier date with males who are better at nest construction, with the opposite being true with males that are not. [68] After building the nest, barn swallows may nest colonially where sufficient high-quality nest sites are available, and within a colony, each pair defends a territory around the nest which, for the European subspecies, is 4 to 8 m2 (40 to 90 sq ft) in size. Colony size tends to be larger in North America. [37]

A juvenile swallow on a red brick in Sussex Hirundo rustica -West Sussex, England -chick-8.jpg
A juvenile swallow on a red brick in Sussex

In North America at least, barn swallows frequently engage in a mutualist relationship with ospreys. Barn swallows will build their nest below an osprey nest, receiving protection from other birds of prey that are repelled by the exclusively fish-eating ospreys. The ospreys are alerted to the presence of these predators by the alarm calls of the swallows. [37]

Barn swallows will normally raise two broods, with the original nest being reused for the second brood and being repaired and reused in subsequent years. The female lays two to seven, but typically four or five, reddish-spotted white eggs. [7] The clutch size is influenced by latitude, with clutch sizes of northern populations being higher on average than southern populations. [69] The eggs are 20 mm × 14 mm (3⁄4 in × 1⁄2 in) in size, and weigh 1.9 grams (29 grains), of which 5% is shell. In Europe, the female does almost all the incubation, but in North America the male may incubate up to 25% of the time. The incubation period is normally 14–19 days, with another 18–23 days before the altricial chicks fledge. The fledged young stay with, and are fed by, the parents for about a week after leaving the nest. Occasionally, first-year birds from the first brood will assist in feeding the second brood. [7] Compared to those from early broods, juvenile barn swallows from late broods have been found to migrate at a younger age, fuel less efficiently during migration and have lower return rates the following year. [70]

Juvenile being fed Barn swallow (feeding) at Tennoji Park in Osaka, June 2016.jpg
Juvenile being fed

The barn swallow will mob intruders such as cats or accipiters that venture too close to their nest, often flying very close to the threat. [60] Adult barn swallows have few predators, but some are taken by accipiters, falcons, and owls. Brood parasitism by cowbirds in North America or cuckoos in Eurasia is rare. [6] [37]

Hatching success is 90% and the fledging survival rate is 70–90%. Average mortality is 70–80% in the first year and 40–70% for the adult. Although the record age is more than 11 years, most survive less than four years. [7] Barn swallow nestlings have prominent red gapes, a feature shown to induce feeding by parent birds. An experiment in manipulating brood size and immune system showed the vividness of the gape was positively correlated with T-cell–mediated immunocompetence, and that larger brood size and injection with an antigen led to a less vivid gape. [71]

The barn swallow has been recorded as hybridising with the cliff swallow (Petrochelidon pyrrhonota) and the cave swallow (P. fulva) in North America, and the house martin (Delichon urbicum) in Eurasia, the cross with the latter being one of the most common passerine hybrids. [60]

Parasites and predators

Feeding trace of Brueelia lice on a tail feather Feather hole.jpg
Feeding trace of Brueelia lice on a tail feather

Barn swallows (and other small passerines) often have characteristic feather holes on their wing and tail feathers. These holes were suggested as being caused by avian lice such as Machaerilaemus malleus and Myrsidea rustica , although other studies suggest that they are mainly caused by species of Brueelia . Several other species of lice have been described from barn swallow hosts, including Brueelia domestica and Philopterus microsomaticus. [72] [73] The avian lice prefer to feed on white tail spots, and they are generally found more numerously on short-tailed males, indicating the function of unbroken white tail spots as a measure of quality. [74] In Texas, the swallow bug ( Oeciacus vicarius ), which is common on species such as the cliff swallow, is also known to infest barn swallows. [75]

Predatory bats such as the greater false vampire bat are known to prey on barn swallows. [76] Swallows at their communal roosts attract predators and several falcon species make use of these opportunities. Falcon species confirmed as predators include the peregrine falcon [77] and the African hobby. [43] In Africa, tigerfish Hydrocynus vittatus have been recorded to routinely leap out of the water to capture low-flying swallows. [78]

Status

Barn swallow at the moment when its beak touches the water to have a drink in Bagmati River, Nepal The barn swallow moment of truth.jpg
Barn swallow at the moment when its beak touches the water to have a drink in Bagmati River, Nepal
A reflection flight of barn swallow A reflection flight of barn swallow.jpg
A reflection flight of barn swallow

The barn swallow has an enormous range, with an estimated global extent of about 250,000,000 km2 (97,000,000 sq mi) and a population of 190 million individuals. The species is evaluated as least concern on the 2019 IUCN Red List, [1] and has no special status under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), which regulates international trade in specimens of wild animals and plants. [37]

This is a species that has greatly benefited historically from forest clearance, which has created the open habitats it prefers, and from human habitation, which have given it an abundance of safe man-made nest sites. There have been local declines due to the use of DDT in Israel in the 1950s, competition for nest sites with house sparrows in the US in the 19th century, and an ongoing gradual decline in numbers in parts of Europe and Asia due to agricultural intensification, reducing the availability of insect food. However, there has been an increase in the population in North America during the 20th century with the greater availability of nesting sites and subsequent range expansion, including the colonisation of northern Alberta. [7]

A specific threat to wintering birds from the European populations is the transformation by the South African government of a light aircraft runway near Durban into an international airport for the 2010 FIFA World Cup. The roughly 250 m (270 yd) square Mount Moreland reed bed is a night roost for more than three million barn swallows, which represent 1% of the global population and 8% of the European breeding population. The reed bed lies on the flight path of aircraft using the proposed La Mercy airport, and there were fears that it would be cleared because the birds could threaten aircraft safety. [79] [80] However, following detailed evaluation, advanced radar technology will be installed to enable planes using the airport to be warned of bird movements and, if necessary, take appropriate measures to avoid the flocks. [39]

Climate change may affect the barn swallow; drought causes weight loss and slow feather regrowth, and the expansion of the Sahara will make it a more formidable obstacle for migrating European birds. Hot dry summers will reduce the availability of insect food for chicks. Conversely, warmer springs may lengthen the breeding season and result in more chicks, and the opportunity to use nest sites outside buildings in the north of the range might also lead to more offspring. [61]

Relationship with humans

In Nederlandsche Vogelen (1770) Nederlandsche vogelen (KB) - Hirundo rustica (030b).jpg
In Nederlandsche Vogelen (1770)

The barn swallow is an attractive bird that feeds on flying insects and has therefore been tolerated by humans when it shares their buildings for nesting. As one of the earlier migrants, this conspicuous species is also seen as an early sign of summer's approach. [81]

In the Old World, the barn swallow appears to have used man-made structures and bridges since time immemorial. An early reference is in Virgil's Georgics (29 BC), "Ante garrula quam tignis nidum suspendat hirundo" (Before the twittering swallow hangs its nest from the rafters). [82]

Many cattle farmers believed that swallows spread Salmonella infections; however, a study in Sweden showed no evidence of the birds being reservoirs of the bacteria. [83]

In literature

Many literary references are based on the barn swallow's northward migration as a symbol of spring or summer. The proverb about the necessity for more than one piece of evidence goes back at least to Aristotle's Nicomachean Ethics : "For as one swallow or one day does not make a spring, so one day or a short time does not make a fortunate or happy man." [81]

The barn swallow symbolises the coming of spring and thus love in the Pervigilium Veneris , a late Latin poem. In his poem "The Waste Land", T. S. Eliot quoted the line "Quando fiam uti chelidon [ut tacere desinam]?" ("When will I be like the swallow, so that I can stop being silent?") This refers to the myth of Philomela in which she turns into a nightingale, and her sister Procne into a swallow. [84]

In culture

Gilbert White studied the barn swallow in detail in his pioneering work The Natural History of Selborne , but even this careful observer was uncertain whether it migrated or hibernated in winter. [16] Elsewhere, its long journeys were well observed, and a swallow tattoo is traditional among sailors as a symbol of a safe return; the tradition was that a mariner had a tattoo of this fellow wanderer after sailing 5,000 nautical miles (9,300 kilometres). A second swallow would be added after 10,000 nmi (19,000 km) at sea. [85]

In the past, the tolerance for this beneficial insectivore was reinforced by superstitions regarding damage to the barn swallow's nest. Such an act might lead to cows giving bloody milk, or no milk at all, or to hens ceasing to lay. [86] This may be a factor in the longevity of swallows' nests. Survival, with suitable annual refurbishment, for 10–15 years is regular, and one nest was reported to have been occupied for 48 years. [86]

It is depicted as the martlet, merlette or merlot in heraldry, where it represents younger sons who have no lands. It is also represented as lacking feet as this was a common belief at the time. [87] As a result of a campaign by ornithologists, the barn swallow has been the national bird of Estonia since 23 June 1960, and is also the national bird of Austria. [88] [89]

See also

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The white-throated swallow is a small bird in the swallow family. It is a common species, found in southern Africa, which has benefited from the increased nesting opportunities presented by the construction of bridges and dams.

<span class="mw-page-title-main">Rock martin</span> Small passerine bird in the swallow family in central and southern Africa

The rock martin is a small passerine bird in the swallow family that is resident in central and southern Africa. It breeds mainly in the mountains, but also at lower altitudes, especially in rocky areas and around towns, and, unlike most swallows, it is often found far from water. It is 12–15 cm (4.7–5.9 in) long, with mainly brown plumage, paler-toned on the upper breast and underwing coverts, and with white "windows" on the spread tail in flight. The sexes are similar in appearance, but juveniles have pale fringes to the upperparts and flight feathers. The former northern subspecies are smaller, paler, and whiter-throated than southern African forms, and are now usually split as a separate species, the pale crag martin. The rock martin hunts along cliff faces for flying insects using a slow flight with much gliding. Its call is a soft twitter.

<span class="mw-page-title-main">Crag martin</span> Genus of birds

The crag martins are four species of small passerine birds in the genus Ptyonoprogne of the swallow family. They are the Eurasian crag martin (P. rupestris), the pale crag martin (P. obsoleta), the rock martin (P. fuligula) and the dusky crag martin (P. concolor). They are closely related to each other, and have formerly sometimes been considered to be one species. They are closely related to the Hirundo barn swallows and are placed in that genus by some authorities. These are small swallows with brown upperparts, paler underparts without a breast band, and a square tail with white patches. They can be distinguished from each other on size, the colour shade of the upperparts and underparts, and minor plumage details like throat colour. They resemble the sand martin, but are darker below, and lack a breast band.

<i>Delichon</i> Genus of passerine birds in the swallow family

Delichon is a small genus of passerine birds that belongs to the swallow family and contains four species called house martins. These are chunky, bull-headed and short-tailed birds, blackish-blue above with a contrasting white rump, and with white or grey underparts. They have feathering on the toes and tarsi that is characteristic of this genus. The house martins are closely related to other swallows that build mud nests, particularly the Hirundo barn swallows. They breed only in Europe, Asia and the mountains of North Africa. Three species, the common, Siberian and Asian house martins, migrate south in winter, while the Nepal house martin is resident in the Himalayas year-round.

<span class="mw-page-title-main">Pale crag martin</span> Passerine bird in the swallow family

The pale crag martin is a small passerine bird in the swallow family that is resident in Northern Africa and in Southwestern Asia, east to Pakistan. It breeds mainly in the mountains, but also at lower altitudes, especially in rocky areas and around towns. Unlike most swallows, it is often found far from water. It is 12–13 cm long, with mainly brown plumage, paler-toned on the upper breast and underwing coverts, and with white "windows" on the spread tail in flight. The sexes are similar in appearance, but juveniles have pale fringes to the upperparts and flight feathers. It was formerly considered to be the northern subspecies of the rock martin of southern Africa, although it is smaller, paler, and whiter-throated than that species. The pale crag martin hunts along cliff faces for flying insects using a slow flight with much gliding. Its call is a soft twitter.

<span class="mw-page-title-main">Brazza's martin</span> Species of bird found in Africa

Brazza's martin is a passerine bird in the swallow family, Hirundinidae. It is 12 centimeters (4.7 in) long with grey-brown upperparts, heavily black-streaked white underparts, and a brownish tint to the breast plumage. The sexes are similar, but juvenile birds have more diffuse breast streaking and reddish-brown edges to the feathers of the back and wings. The song consists of a series of short notes of increasing frequency, followed by a complex buzz that is sometimes completed by a number of clicks.

<span class="mw-page-title-main">White-rumped swallow</span> Species of bird

The white-rumped swallow is a species of bird in the family Hirundinidae. First described and given its binomial name by French ornithologist Louis Pierre Vieillot in 1817, it was for many years considered a subspecies of the Chilean swallow. The species is monotypic with no known population variations. It has a white supraloral streak, or streak above its lores, which can be used to differentiate it from the Chilean swallow. The lores, ear coverts, tail, and wings are black, with white tips on the inner secondaries, tertials, and greater coverts of the wings. The rest of the upperparts are a glossy blue. Its underparts and underwing-coverts are white, in addition to the rump, as the name suggests. The sexes are similar, and the juvenile is duller and browner with a dusky breast.

<span class="mw-page-title-main">Feather hole</span>

Feather holes often characteristically occur on wing and tail feathers of some small-bodied species of passerines. In the case of barn swallows, it was suggested that the holes were feeding traces of avian lice, either Machaerilaemus malleus and/or Myrsidea rustica.

References

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