Plain swift

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Plain swift
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Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Apodiformes
Family: Apodidae
Genus: Apus
Species:
A. unicolor
Binomial name
Apus unicolor
(Jardine, 1830)

The plain swift (Apus unicolor) is a medium-sized swift. Although this bird is superficially similar to a barn swallow or house martin, it is not related to those passerine species. The resemblances between the groups are due to convergent evolution reflecting similar life styles.

Swifts have very short legs that they use only for clinging to vertical surfaces. They never settle voluntarily on the ground, and spend most of their lives in the air, feeding on insects that they catch in their beaks. They drink on the wing.

Plain swifts breed in colonies on cliffs, bridges and buildings on the Canary Islands and Madeira, laying two eggs in a saucer-shaped nest made of flowerheads glued with saliva. They are partially migratory, with many birds leaving to winter in mainland Africa. Until recently it was thought that the birds wintered on the African coast but recent studies suggest they travel much further to the equatorial forests of Liberia and Guinea, a distance of 2,600 kilometres. Small numbers are also believed to breed in Morocco between Agadir and Essaouira, where a colony was found on coastal cliffs and possibly also in Mauritania where there are frequent sightings [2]

This 14–15 cm long species is very similar to the closely related common and pallid swifts, which also occur in the archipelagos, and separation is only possible with good views. Like its relatives, it has a short forked tail and very long swept-back wings that resemble a crescent or a boomerang.

It is entirely dark except for an indistinct pale throat patch. It is slimmer and more rakish than the pallid swift, and is darker than that species and lacks the obvious white throat.

Distinguishing the plain swift from the similarly plumaged common swift is much more difficult, although juvenile common can be easily eliminated due to its white throat. The plain is slimmer and appears longer winged than the common, and has scaly underparts, difficult to see except with excellent views. The call is a loud dry scream similar to that of the common swift, though possibly higher pitched.

Related Research Articles

Common swift Species of bird

The common swift is a medium-sized bird, superficially similar to the barn swallow or house martin but somewhat larger, though not stemming from those passerine species, being in the order Apodiformes. The resemblances between the groups are due to convergent evolution, reflecting similar contextual development. The swifts' nearest relatives are the New World hummingbirds and the Southeast Asian treeswifts.

Pallid harrier Species of bird

The pale or pallid harrier is a migratory bird of prey of the harrier subfamily. The scientific name is derived from the Ancient Greek. Circus is from kirkos, referring to a bird of prey named for its circling flight, probably the hen harrier and macrourus is "long-tailed", from makros, "long" and -ouros "-tailed".

Spotless starling Species of bird

The spotless starling is a passerine bird in the starling family, Sturnidae. It is closely related to the common starling, but has a much more restricted range, confined to the Iberian Peninsula, Northwest Africa, southernmost France, and the islands of Sicily, Corsica and Sardinia. It is largely non-migratory.

Alpine swift Species of bird

The alpine swift formerly Apus melba, is a species of swift found in Africa, southern Europe and Asia. They breed in mountains from southern Europe to the Himalaya. Like common swifts, they are migratory; the southern European population winters further south in southern Africa. They have very short legs which are used for clinging to vertical surfaces. Like most swifts, they never settle voluntarily on the ground, spending most of their lives in the air living on the insects they catch in their beaks.

Little swift Species of bird

The little swift, is a small species of swift found in Africa and southwestern Asia, and are vagrants and local breeders in southern Europe. They are found both in urban areas and at rocky cliffs where they build nests in a way typical of all members of the order Apodiformes. The genus name Apus is Latin for a swift, thought by the ancients to be a type of swallow without feet. The Latin specific affinis means similar to or related to, but in this case the species that the little swift supposedly resembles is not clear from the description. A population formerly considered to be an eastern subspecies of little swift is now separated as a distinct species, the house swift.

Pallid swift Species of bird

The pallid swift is a small bird, superficially similar to a barn swallow or house martin. It is, however, completely unrelated to those passerine species, since the swifts are in the order Apodiformes. The resemblances between the groups are due to convergent evolution reflecting similar life styles.

Pacific swift Species of bird which breeds in eastern Asia

The Pacific swift is a species of bird that is part of the Swift family. It breeds in eastern Asia. It is strongly migratory, spending the northern hemisphere's winter in Southeast Asia and Australia. The general shape and blackish plumage recall its relative, the common swift, from which it is distinguished by a white rump band and heavily marked underparts. The sexes are identical in appearance, although young birds can be identified by pale fringes to the wing feathers that are absent in adults. This swift's main call is a screech typical of its family. It is one of a group of closely related Asian swifts formerly regarded as one species.

Brown-backed needletail Species of bird

The brown-backed needletail, or brown needletail, is a large swift.

White-throated bee-eater Species of bird

The white-throated bee-eater is a near passerine bird in the bee-eater family, Meropidae. It breeds in semi-desert along the southern edge of the Sahara, Africa. The white-throated bee-eater is migratory, wintering in a completely different habitat in the equatorial rain forests of Africa from southern Senegal to Uganda.

White-rumped swift Species of bird

The white-rumped swift is a species of swift. Although this small bird is superficially similar to a house martin, it is not closely related to that passerine species. The resemblances between the swallows and swifts are due to convergent evolution reflecting similar life styles.

<i>Apus</i> (bird) Genus of birds

The bird genus Apus comprise some of the Old World members of the family Apodidae, commonly known as swifts.

White-throated swift Species of bird

The white-throated swift is a swift of the family Apodidae native to western North America, south to cordilleran western Honduras. Its coastal range extends as far north as Northern California, while inland it has migratory populations found throughout the Great Basin and Rocky Mountain regions, ranging as far north as southern British Columbia. White-throated swifts are found in open areas near cliffs, rock faces, or man-made structures, where they roost. Swifts are social birds, and groups are often seen roosting and foraging for flying insects together.

African black swift Species of bird

The African black swift, also known as the African swift or black swift, is a medium-sized bird in the swift family. It breeds in Africa discontinuously from Liberia, Cameroon, Zaire, Uganda and Kenya southwards to South Africa. The "black swifts" of Madagascar and the Comoros are either taken as two subspecies of the African black swift, or otherwise deemed a full species, the Malagasy black swift.

Horus swift Species of bird

The Horus swift is a small bird in the swift family. It breeds in sub-Saharan Africa. It has an extensive continuous distribution from eastern and southern South Africa north to southern Zambia and central Mozambique, and has recently colonised the De Hoop Nature Reserve area of the Western Cape.

The Cape Verde swift or Alexander's swift is a small bird of the swift family found only in the Cape Verde Islands. It has been recorded from all the islands except Santa Luzia although it probably breeds only on Santiago, Fogo, Brava, Santo Antão and São Nicolau. It is generally common with a stable population and is not considered to be threatened. The name Alexander's swift commemorates Boyd Alexander, an English ornithologist who led two expeditions to the islands in 1897.

Bates's swift is a species of small swift in the family Apodidae which is found in western Africa.

Salim Ali's swift is a small bird, superficially similar to a house martin. It is, however, completely unrelated to those passerine species, since swifts are in the order Apodiformes. The resemblances between the groups are due to convergent evolution reflecting similar life styles.

Blyth's swift, is a small bird, superficially similar to a house martin. It is, however, completely unrelated to those passerine species, since swifts are in the order Apodiformes. The resemblances between the groups are due to convergent evolution reflecting similar life styles.

Cook's swift is a small bird, superficially similar to a house martin. It is, however, completely unrelated to those passerine species, since swifts are in the order Apodiformes. The resemblances between the groups are due to convergent evolution reflecting similar life styles.

References

  1. BirdLife International (2017). "Apus unicolor". IUCN Red List of Threatened Species . 2017: e.T22686806A119263428. doi: 10.2305/IUCN.UK.2017-3.RLTS.T22686806A119263428.en . Retrieved 11 November 2021.
  2. Norton, T., Atkinson, P., Hewson, C. & Eduardo Garcia-del-Rey, E. 2018. Geolocator study reveals that Canarian Plain Swifts Apus unicolor winter in equatorial West Africa. African Bird Club & Sociedad Ornitologica Canaria. 15 pp