White-eyed river martin

The white-eyed river martin (Pseudochelidon sirintarae) is a passerine bird, one of only two members of the river martin subfamily of the swallows. Since it has significant differences from its closest relative, the African river martin, it is sometimes placed in its own genus, Eurochelidon. First found in 1968, it is known only from a single wintering site in Thailand, and may be extinct, since it has not been seen since 1980 despite targeted surveys in Thailand and neighbouring Cambodia. It may possibly still breed in China or Southeast Asia, but a Chinese painting initially thought to depict this species was later reassessed as showing pratincoles.

The adult white-eyed river martin is a medium-sized swallow, with mainly glossy greenish-black plumage, a white rump, and a tail which has two elongated slender central tail feathers, each widening to a racket-shape at the tip. It has a white eye ring and a broad, bright greenish-yellow bill. The sexes are similar in appearance, but the juvenile lacks the tail ornaments and is generally browner than the adult. Little is known of the behaviour or breeding habitat of this martin, although like other swallows it feeds on insects caught in flight, and its wide bill suggests that it may take relatively large species. It roosts in reed beds in winter, and may nest in river sandbanks, probably in April or May before the summer rains. It may have been overlooked prior to its discovery because it tended to feed at dawn or dusk rather than during the day.

The martin's apparent demise may have been hastened by trapping, loss of habitat and the construction of dams. The winter swallow roosts at the only known location of this martin have greatly reduced in numbers, and birds using river habitats for breeding have declined throughout the region. The white-eyed river martin is one of only two birds endemic to Thailand, and the country's government has noted this through the issues of a stamp and a high-value commemorative coin.

White-eyed river martin
PseudochelidonSirintarae
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Hirundinidae
Genus: Pseudochelidon
Species:
P. sirintarae
Binomial name
Pseudochelidon sirintarae
Pseudochelidon sirintarae map
Spot shows former wintering location within Thailand; the breeding range is unknown
Synonyms
Eurochelidon sirintarae
(Thonglongya, 1968)

Taxonomy

Within the swallow family, the white-eyed river martin is one of only two members of the river martin subfamily Pseudochelidoninae, the other being the African river martin Pseudochelidon eurystomina of the Congo basin in Africa. These two species possess a number of distinctive features which mark them out from other swallows and martins, including their robust legs and feet, and stout bills.[3] The extent of their differences from other swallows and the wide geographical separation of the two martins suggest that they are relict populations of a group of species that diverged from the main swallow lineage early in its evolution.[3] The separation of this subfamily is supported by genetic evidence,[4] and their habit of nesting in burrows is thought to be characteristic of the earliest members of the swallow family.[5]

The white-eyed river martin was discovered in 1968 by Thai ornithologist Kitti Thonglongya, who gave the bird its current binomial name.[6][7] The genus name Pseudochelidon (Hartlaub, 1861) comes from the Ancient Greek prefix ψευδο/pseudo "false" and χελιδον/chelidôn, "swallow",[8] and the species name sirintarae commemorates Princess Maha Chakri Sirindhorn of Thailand.[9]

The African and Asian Pseudochelidon species differ markedly in the size of their bills and eyes, suggesting that they have different feeding ecologies, with the white-eyed river martin probably able to take much larger prey. The Thai species also has a swollen, hard gape (fleshy interior of the bill) unlike the softer, fleshier, and much less prominent gape of the African river martin.[9] Thonglongya estimated the bill of the Thai species to be 17.6% wider than that of the African bird, but a later estimate, using specimens preserved in alcohol instead of dried skins (to avoid shrinkage), gave a difference of 22.5% between the bills of the two swallows.[10] Following a suggestion by Kitti in his original paper,[6] Richard Brooke proposed in 1972 that the white-eyed river martin was sufficiently different from the African species to be placed in a separate monotypic genus Eurochelidon,[11] but this was contested by other authorities.[10][12][13] The new genus was not subsequently widely adopted by other authors,[3][7][9] although BirdLife International uses Eurochelidon.[14]

Description

The adult white-eyed river martin is a medium-sized swallow, 18 cm (7 in) long, with mainly silky black plumage and a white rump. The back is green-glossed black, and is separated from the similarly coloured upper tail by a narrow bright white rump band. The head is darker than the back, with a velvet-black chin leading to blue-green glossed black underparts. The wings are black, with brown inner edges to the flight feathers,[3] and the tail is green-glossed black with two elongated, slender, central tail feathers, up to 9 cm (3.5 in) long.[15] These expand slightly at the tips to give narrow racquets 4.9–8.5 cm (1.9–3.3 in) long. The wing length averages 11.5 cm (4.5 in), the tail is 10.7 cm (4.2 in) long, and the tarsus averages 1.1 cm (0.43 in).[3]

The iris and eyelid are white, giving the appearance of a white eye ring, and the broad, bright greenish-yellow bill has a black hooked tip to the upper mandible. The large, strong feet and legs are flesh-coloured. This species is silent when wintering, and its breeding vocalisations are unknown.[3] The sexes are similar, but the juvenile lacks the tail racquets, has a brown head and chin, and is generally browner than the adult. Juveniles taken in January and February were moulting their body feathers.[3]

The original Thai name for the Pseudochelidon, only known to local people in Bueng Boraphet, was นกตาพอง Nok Ta Phong which may be roughly translated as "bird with enlarged eyes". After its official discovery in 1968, it was named เจ้าฟ้าหญิงสิรินธร Nok Chaofa Ying Sirinthon ("Princess Sirindhorn bird").

Distribution and habitat

The white-eyed river martin was discovered in 1968 by Kitti Thonglongya,[6] who obtained nine specimens netted by professional bird-hunters as part of a migratory bird survey at a night-time roost at Thailand's largest freshwater lake, Bueng Boraphet in Nakhon Sawan Province.[16] It was first seen in the wild by ornithologists at the same wintering site in 1977.[17] The species has only been seen at the lake, always between the months of November and February, and the wintering habitat is assumed to be in the vicinity of open fresh water for feeding, with reed beds for the night-time roost.[18]

The white-eyed river martin may be migratory, and if the breeding habitat resembles that of the African river martin, it is likely to be the forested valleys of large rivers; these can provide sandbars and islands for nesting, and woodland over which the birds can catch insect prey.[3] The breeding grounds and habitat are unknown, although river valleys in northern Thailand or southwestern China are possibilities.[3] A claimed depiction of this species in a Chinese scroll painting initially appeared to support the possibility of the martin breeding in China. The bird in the painting had a similarly shaped head and bill, a white eye and a long tail, although it lacked the white rump, did not show the correct bill colour, and elongated the outer, rather than central, tail feathers. Painted before 1970, it pre-dated the publication of pictures of the Thai bird, so it must have been painted from life.[19] It is now thought more likely that the scroll shows Oriental pratincoles (Glareola maldivarum).[20][21] Cambodia and Burma have also been suggested as possible refuges for the martin,[18] but there has also been speculation on whether it is migratory at all.[9]

Behaviour

African River Martin Hartlaub
The African river martin is the white-eyed river martin's closest relative, and the two species may have similar breeding habits.

Since its breeding grounds are undiscovered, nothing is known about the white-eyed river martin's breeding biology, although it is suggested that it may nest in burrows in river sandbars,[22] probably in April or May before the monsoon rain raises water levels.[3] However, distinct differences in foot and toe morphology from its African relative have led some authorities to speculate that even the assumption that it nests in burrows could be incorrect.[13] In winter, it roosts with barn swallows in reed beds.[22]

Like other swallows, the white-eyed river martin feeds on insects, including beetles, which are caught on the wing.[3] Given its size and unusual mouth structure, it may well take larger insects than other swallows.[9] This species is described as graceful and buoyant in flight, and, like its African relative, appears reluctant to use perches,[3] behaviour that, together with its unusual toe-shape and the fact that mud was found on the toes of one of the first specimens, suggest that this species may be relatively terrestrial.[23]

Pamela C. Rasmussen suggested that, given its unusually large eyes, the species might be nocturnal or at least crepuscular, a factor that could make it very inconspicuous, and thus partly explain how it remained undetected for so long. Although the fact that the first specimens were supposedly collected roosting at night in reedbeds might appear to contradict this theory, it is possible that the birds might not have been caught at the roost. Alternatively, they might be capable of both diurnal and nocturnal behaviour, or be crepuscular, depending on the season or circumstance.[13]

Status

The white-eyed river martin was seen in Thailand in 1972, 1977 and 1980, but not definitely since,[3] although there is an unconfirmed sighting from Thailand from 1986.[18] It is classified as Critically Endangered, which is the highest risk category assigned by the International Union for the Conservation of Nature and Natural Resources (IUCN) for wild species. The designation means that a species' numbers have decreased, or will decrease, by 80% within three generations. The IUCN does not consider a species extinct until extensive targeted surveys have been conducted, but the white-eyed river martin may well no longer exist in the wild,[1] and was probably always rare.[3]

There has been a drastic decline in the Bueng Boraphet swallow population from the hundreds of thousands reported to roost around 1970 to maximum counts of 8,000 made in the winter of 1980–1981, although it is not certain if this represents a real decline or a shift in site in response to hunting.[9] Other potential causes for the martin's decline include the disturbance of sand bars in the rivers, and the construction of dams (which flood the area upstream and change the water flow downstream), deforestation, and increasing conversion of its habitat to agriculture.[18] Other Southeast Asian species using riverine sand bars have also been adversely affected by disturbance and habitat degradation.[24] Very few swallows of any kind now roost in the Bueng Boraphet reedbeds, preferring sugarcane plantations, and, despite searching, the white-eyed river martin has not been found in other nearby large swallow roosts.[9]

Hirundo rustica - Bueng Boraphet
The numbers of barn swallows at Bueng Boraphet, which the martin accompanied to roost, are greatly reduced.

The martin is legally protected under Appendix 1 (the highest category) of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) agreement,[25] and is one of 15 "Reserved Species" in Thailand which, under the provisions of the Wild Animal Reservation and Protection Act, BE 2535, cannot be legally hunted, collected, or kept in captivity under any circumstances.[26][27] Despite official protection, the martin was captured by locals along with other swallows for sale as food or for release by devout Buddhists, and following its discovery by ornithologists, trappers were reported to have caught as many as 120 individuals and sold them to the director of the Nakhon Sawan Fisheries Station who was unable to keep them alive in captivity.[13] Two birds sent to Bangkok Zoo in 1971 also soon died.[28] The small population may therefore have become non-viable.[3]

Bueng Boraphet has been declared a Non-Hunting Area in an effort to protect the species,[18] but surveys to find this martin have been unsuccessful. These include several searches at the main site, a 1969 survey of the Nan, Yom and Wang Rivers of northern Thailand, and a 1996 survey of rivers in northern Laos.[18] A possible sighting was made in Cambodia in 2004,[29] but a 2008 investigation using speedboat surveys and interviews with villagers in Cambodia near the location of the claimed sighting failed to find any positive evidence, and noted that the habitat was in poor condition.[1] Nevertheless, animals as a large as the saola have been rediscovered in Southeast Asia, so it is conceivable that a small population of the martin survives.[30] Despite the lack of records from China, a 2000 field guide covering the region included this species, since it is the mostly likely breeding area outside Thailand,[31] although it is omitted from the 2008 Birds of East Asia.[32]

The white-eyed river martin and the Deignan's babbler, Stachyridopsis rodolphei,[a] are the only bird species endemic to Thailand,[34] and the martin has attracted sufficient interest to be featured on a 75 satang postage stamp in 1975, as one of a set of four depicting Thai birds,[35] and on a 5,000 Thai baht conservation issue gold coin in 1974.[36]

Notes

  1. ^ The status of Deignan's babbler is disputed, some authorities considering it to be a subspecies of rufous-fronted babbler, Stachyridopsis rufifrons. It is currently still listed as separate species by the International Ornithologists' Union.[33]

References

  1. ^ a b c BirdLife International (2012). "Eurochelidon sirintarae". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ^ Dickinson, E C; Dekker, R W R J; Eck, S & Somadikarta, S (2001). "Systematic notes on Asian birds. 14. Types of the Hirundinidae". Zoologische Verhandelingen, Leiden. 335: 145–166.
  3. ^ a b c d e f g h i j k l m n o p Turner & Rose (1989) pp. 86–88.
  4. ^ Sheldon, Frederick H; Whittingham, Linda A; Moyle, Robert G; Slikas, Beth; Winkler, David W (2005). "Phylogeny of swallows (Aves: Hirundinidae) estimated from nuclear and mitochondrial DNA". Molecular Phylogenetics & Evolution. 35 (1): 254–270. doi:10.1016/j.ympev.2004.11.008. PMID 15737595.
  5. ^ Winkler, David W; Sheldon, Frederick H (1993). "Evolution of nest construction in swallows (Hirundinidae): A molecular phylogenetic perspective". Proceedings of the National Academy of Sciences USA. 90 (12): 5705–5707. doi:10.1073/pnas.90.12.5705. PMC 46790. PMID 8516319.
  6. ^ a b c Kitti, Thonglongya (1968). "A new martin of the genus Pseudochelidon from Thailand". Thai National Scientific Papers Fauna Series no. 1: 3–10.
  7. ^ a b "Waxwings to swallows". IOC World Bird List version 3.2. International Ornithologists' Union. Retrieved 22 October 2012.
  8. ^ Poley, S B. "Scientific bird names explained". uk.r.b. Retrieved 23 October 2012.
  9. ^ a b c d e f g Tobias, Joe (2000). "Little known Oriental Bird: White-eyed River-Martin: 1". Oriental Bird Club Bulletin. 31: 45–48. Archived from the original on January 29, 2006.
  10. ^ a b Zusi, Richard L (1978). "Remarks on the generic allocation of Pseudochelidon sirintarae". Bulletin of the British Ornithologists' Club. 98 (1): 13–15.
  11. ^ Brooke, Richard (1972). "Generic limits in Old World Apodidae and Hirundinidae". Bulletin of the British Ornithologists' Club. 92: 53–57.
  12. ^ Turner & Rose (1989) pp. 5–6.
  13. ^ a b c d Collar, N J; Andreev, A V; Chan, S; Crosby M J.; Subramanya, S; Tobias, J A, eds. (2001). Threatened Birds of Asia; The BirdLife International Red Data Book (PDF). BirdLife International. pp. 1942–1947. ISBN 0-946888-44-2.
  14. ^ "BirdLife International Species factsheet: Eurochelidon sirintarae". BirdLife International. Retrieved 23 October 2012.
  15. ^ Robson, Craig (2004). A Field Guide to the Birds of Thailand. New Holland Press. p. 206. ISBN 1-84330-921-1.
  16. ^ Humphrey, Stephen R; Bain, James R (1990). Endangered Animals of Thailand. CRC Press. pp. 228–229. ISBN 1-877743-07-0.
  17. ^ King, Ben; Kanwanich, Supradit (1978). "First wild sighting of the white-eyed river-martin". Biological Conservation. 13 (3): 183–185. doi:10.1016/0006-3207(78)90034-4.
  18. ^ a b c d e f Erik Hirschfeld, ed. (2007). Rare Birds Yearbook 2008. MagDig Media. p. 208. ISBN 978-0-9552607-3-5.
  19. ^ Dickinson, Edward C (1986). "Does the White-eyed River-martin Pseudochelidon sirintarae breed in China?" (PDF). Forktail. 2: 95–96. Archived from the original (PDF) on June 10, 2011.
  20. ^ Smallwood, John A (1992). "Recent literature" (PDF). Journal of Field Ornithology. 63 (2): 217–240.
  21. ^ Parkes, K C (1987). "Was the 'Chinese' white-eyed river-martin an Oriental pratincole?" (PDF). Forktail. 3: 68–69. Archived from the original (PDF) on June 10, 2011.
  22. ^ a b Lekagul, Boonsong; Round, Philip (1991). A Guide to the Birds of Thailand. Saha Karn Baet. p. 233. ISBN 974-85673-6-2.
  23. ^ Tobias, Joe (June 2000). "Little known Oriental Bird: White-eyed River-Martin: 2". Oriental Bird Club Bulletin. 31: 45–48. Archived from the original on February 10, 2007.
  24. ^ "Threatened biodiversity in Southeast Asian river basins". Biodiversity and Conservation. Convention on Biological Diversity. Archived from the original on August 8, 2009. Retrieved 25 October 2012.
  25. ^ "Appendices I, II and III, valid from 25 September 2012". CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora). Retrieved 23 October 2012.
  26. ^ "Wildlife conservation in Thailand" (PDF). Wildlife Conservation Division, Royal Forest Department. Retrieved 25 October 2012.
  27. ^ "Wild Animal Reservation and Protection Act B.E. 2535 (1992)" (PDF). National Assembly of Thailand. Retrieved 25 October 2012.
  28. ^ Sophasan, S; Dobias, R (1984). "The fate of the 'princess bird', or white-eyed river martin (Pseudochelidon sirintarae)". Natural History Bulletin of the Siam Society. 32 (1): 1–10.
  29. ^ "Investigating a possible sighting of White-eyed River-Martin". Thaibirding.com. Retrieved 23 October 2012.
  30. ^ Dung, V V; Giao, P M; Chinh N N; Tuoc, D; MacKinnon, J (1995). "Discovery and conservation of the Vu Quang ox in Vietnam". Biological Conservation. 72 (3): 410. doi:10.1016/0006-3207(95)93782-8.
  31. ^ MacKinnon, John; Phillipps, Karen; Showler, Dave (2000). A Field Guide to the Birds of China. Oxford University Press. ISBN 0-19-854940-7. Plate 89.
  32. ^ Brazil, Mark (2008). Birds of East Asia. Christopher Helm. pp. 320–325. ISBN 0-7136-7040-1.
  33. ^ "Old World warblers & babblers". IOC World Bird List version 3.2. International Ornithologists' Union. Archived from the original on March 24, 2010. Retrieved 25 October 2012.
  34. ^ Round, Philip D; International Council for Bird Preservation (1988). Resident forest birds in Thailand. BirdLife International. p. xi. ISBN 0-946888-13-2.
  35. ^ "White-eyed River Martin". Birds of the World on Postage Stamps. Retrieved 23 October 2012.
  36. ^ "Thailand 5000 Baht 1975 st". Goldmünzen (in German). Münzhandlung Ritter GmbH. Archived from the original on 2012-02-09. Retrieved 21 October 2012.

Cited texts

External links

African river martin

The African river martin (Pseudochelidon eurystomina) is a passerine bird, one of two members of the river martin subfamily of the swallow family, Hirundinidae. When discovered, it was not initially recognised as a swallow, and its structural differences from most of its relatives, including its stout bill and robust legs and feet, have led to its current placement in a separate subfamily shared only with the Asian white-eyed river martin. The African river martin is a large swallow, mainly black with a blue-green gloss to the head and a greener tint to the back and wings. The under-wings are brownish, the underparts are purple-black, and the flight feathers are black. This martin has red eyes, a broad orange-red bill and a black, square tail. Young birds are similar in appearance to the adults, but have browner plumage. This species has a variety of unmusical calls, and displays both in flight and on the ground, although the purpose of the terrestrial display is unknown.

The main breeding areas are in the Democratic Republic of the Congo (DRC) along the Congo River and its tributary, the Ubangi, in habitats characterised by a mixture of tropical forest types including swampy or seasonally flooded woodland. The African river martin is migratory, wintering in coastal savanna in southern Gabon and the Republic of the Congo. Breeding also occurs in these coastal areas, but it is unknown whether the migrants are raising a second brood or if there is a separate resident population. This martin feeds in flocks throughout the year, catching a variety of insects in the air, especially flying ants. It does not use perches during the breeding season, although it will often land on the ground.

The African river martin nests in burrows in river sand banks, often alongside rosy bee-eaters, but its incubation and fledging times are not known. It also digs tunnels for night-time shelter when in its wintering areas. It appears to be common within its restricted range, despite being caught in large numbers by the local population for food, and large flocks are sometimes seen. However, due to a lack of detailed information about its breeding range and population numbers, this species is classed as Data Deficient by the International Union for Conservation of Nature (IUCN).

Atticora

Atticora is a genus of bird in the swallow family Hirundinidae. These species are found in South America.

It contains the following two species:

White-banded swallow (Atticora fasciata)

Black-collared swallow (Atticora melanoleuca)

Black-and-rufous swallow

The black-and-rufous swallow (Hirundo nigrorufa) is a species of bird in the family Hirundinidae.

Bueng Boraphet

Bueng Boraphet (Thai: บึงบอระเพ็ด, pronounced [bɯ̄ŋ bɔ̄ː.rā.pʰét]) is the largest freshwater swamp and lake in central Thailand. It covers an area of 224 km2 east of Nakhon Sawan, south of the Nan River close to its confluence with the Ping River.

Originally the area was covered by a large swamp, which was flooded in 1930 with the building of a dam to improve fishing.

This is the only known site for the white-eyed river martin which used to winter there, but has not been seen since 1980, and may be extinct.One hundred-six square kilometres of the lake were declared a non-hunting area in 1975. In 2000 it was designated a wetland of international importance by the Thai government.

Chulalongkorn University Museum of Natural History

The Chulalongkorn University Museum of Natural History, founded in 1954, is operated by the Chulalongkorn University's Faculty of Science in the Biology Building at the university's main campus in Bangkok, Thailand. The museum features exhibits of various (mainly zoological) organisms, including mounts of the endangered white-eyed river martin (Princess Sirindhorn bird). The majority of the museum's exhibits are housed in its main hall, with dedicated rooms featuring Thai turtles and softshells, insects and land snails.

The museum publishes the Natural History Journal of Chulalongkorn University, and has been a partner of the Smithsonian Institution Libraries since 1976.

Forest swallow

The forest swallow (Petrochelidon fuliginosa) is a species of bird in the family Hirundinidae.

It is found in Cameroon, Republic of the Congo, Equatorial Guinea, Gabon, and Nigeria.

Galápagos martin

The Galápagos martin (Progne modesta) is a species of bird in the Hirundinidae family, endemic to the Galápagos Islands.

Its natural habitats are subtropical or tropical dry shrubland, subtropical or tropical seasonally wet or flooded lowland grassland, pastureland, and heavily degraded former forest.

Peruvian martin

The Peruvian martin (Progne murphyi) is a species of bird in the family Hirundinidae. It is found in Peru and far norther Chile.

Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist montane forest, subtropical or tropical dry lowland grassland, subtropical or tropical high-altitude grassland, pastureland, and urban areas. It is threatened by habitat loss.

Preuss's cliff swallow

Preuss's cliff swallow (Petrochelidon preussi), also known as Preuss's swallow, is a species of bird in the family Hirundinidae.

Progne

Progne is a genus of birds. The genus name refers to Procne (Πρόκνη), a mythological girl who was turned into a swallow to save her from her husband. She had killed their son to avenge the rape of her sister.

Reserved wild animals of Thailand

Thailand has nineteen designated reserved wild animal species, which are defined by the Wild Animal Reservation and Protection Act of BE 2535 (1992). It prohibits hunting, breeding, possessing, or trading any of such species, except when done for scientific research with permission from the Permanent Secretary of National Park, Wildlife and Plant Conservation, or breeding and possession by authorised public zoos.

The nineteen reserved species are:

White-eyed river martin (Pseudochelidon sirintarae)

Javan rhinoceros (Rhinoceros sondaicus)

Sumatran rhinoceros (Dicerorhinus sumatrensis)

Kouprey (Bos sauveli)

Wild Asian water buffalo (Bubalus bubalis (B. arnee))

Eld's deer (Cervus eldii)

Schomburgk's deer (Cervus schomburgki)

Mainland serow (Capricornis sumatraensis)

Chinese goral (Naemorhedus griseus)

Gurney's pitta (Pitta gurneyi)

Sarus crane (Grus antigone)

Marbled cat (Pardofelis marmorata)

Malayan tapir (Tapirus indicus)

Fea's muntjac (Muntiacus feae)

Dugong (Dugong dugon)

Whale shark (Rhincodon typus)

Bryde's whale (Balaenoptera edeni)

Omura's whale (Balaenoptera omurai)

Leatherback turtle (Dermochelys coriacea)Of these nineteen species, the Schomburgk's deer is already extinct, and the Javan and Sumatran rhinoceros are locally extinct in Thailand.

River martin

The river martins form a distinctive subfamily Pseudochelidoninae within the swallow and martin bird family Hirundinidae. The two species are the African river martin Pseudochelidon eurystomina, found in the Congo and Gabon, and the white-eyed river martin Pseudochelidon sirintarae, known only from one site in Thailand. These are medium-sized, largely black swallows that have a light buoyant flight and feed on insects caught in the air. They appear to be more terrestrial than other swallows, frequently walking rather than perching, and the white-eyed may be crepuscular. The African species excavates nest holes in sandy ridges in rivers, while the breeding locations and habits of the Asian bird are unknown.

When the African river martin was first discovered in the 19th century, Gustav Hartlaub thought it was a roller, and later authors either placed it in its own family, or with the woodswallows. Study of the anatomy revealed that the species was closest to the swallows and martins, but that it possessed a number of distinctive features, such as its robust legs and feet and stout bill. These indicated that it should be placed in a separate subfamily. The two river martin species are usually considered to belong to a single genus, Pseudochelidon, due to their having a number of structural similarities. However, Brooke proposed that the white-eyed river martin be placed in a separate monotypic genus Eurochelidon.

The African river martin has a restricted distribution; it appears to be locally numerous, although its true status has not been fully investigated. The white-eyed river martin was discovered as recently as 1969 and is only known from specimens and anecdotal evidence – no modern ornithologists have seen the species in the wild, and its breeding grounds are unknown. It may be extinct, although a possible sighting was reported in 2004.

Saw-wing

The saw-wings, Psalidoprocne, is a small genus of passerine birds in the swallow family. The common name of this group is derived from the rough outer edge of the outer primary feather on the wing, which is rough due to recurved barbs. The function of this is unknown. The birds are 11–17 cm long and black or black-and-white in colour. The genus has an African distribution and all species can be found foraging over forest and woodland.

Sinaloa martin

The Sinaloa martin (Progne sinaloae) is a species of bird in the family Hirundinidae.

It breeds semicolonially in sheer cliff faces within pine-oak forests of the Sierra Madre Occidental of western Mexico. Presumed migrant records also come from Belize and Guatemala. It is assumed to winter in South America.

Southern martin

The southern martin (Progne elegans) is a species of bird in the family Hirundinidae.

It is found in Argentina and southern Bolivia ; in winter it migrates to the western Amazon Basin.

Its natural habitats are subtropical or tropical moist lowland forest, subtropical or tropical moist montane forest, subtropical or tropical dry lowland grassland, subtropical or tropical high-altitude grassland, and urban areas.

Stelgidopteryx

Stelgidopteryx (Baird, 1858) is a small genus of swallows. It contains two species:

Adults of both species are brown on top with lighter underparts and a slightly forked tail. They nest in cavities but do not excavate their holes or form colonies.

These birds forage in flight over water or fields, usually flying low. They eat insects.

"Rough-winged" refers to the serrated edge feathers on the wing of this genus; this feature would only be apparent in the hand.

Swallow

The swallows, martins and saw-wings, or Hirundinidae, are a family of passerine birds found around the world on all continents, including occasionally in Antarctica. Highly adapted to aerial feeding, they have a distinctive appearance. The term Swallow is used colloquially in Europe as a synonym for the barn swallow. There are around 90 species of Hirundinidae, divided into 19 genera, with the greatest diversity found in Africa, which is also thought to be where they evolved as hole-nesters. They also occur on a number of oceanic islands. A number of European and North American species are long-distance migrants; by contrast, the West and South African swallows are non-migratory.

This family comprises two subfamilies: Pseudochelidoninae (the river martins of the genus Pseudochelidon) and Hirundininae (all other swallows, martins and saw-wings). Within the Old World, the name martin tends to be used for the squarer-tailed species, and the name swallow for the more fork-tailed species; however, there is no scientific distinction between these two groups. Within the New World, "martin" is reserved for members of the genus Progne. (These two systems are responsible for the sand martin being called "bank swallow" in the New World.)

Tumbes swallow

The Tumbes swallow (Tachycineta stolzmanni) is a species of bird in the family Hirundinidae.

It is found in northwestern Peru and far southwestern Ecuador.

Its natural habitats are dry savanna, coastal saline lagoons, and arable land.

Swallows (family: Hirundinidae)

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