White-tailed kite

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White-tailed kite
Elanus leucurus 3.jpg
White-tailed kite with prey.
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Accipitriformes
Family: Accipitridae
Genus: Elanus
Species:
E. leucurus
Binomial name
Elanus leucurus
(Vieillot, 1818)
Subspecies [2]
  • E. l. majusculus - Bangs & Penard, TE, 1920
  • E. l. leucurus - (Vieillot, 1818)
Elanus leucurus range.svg
Synonyms

Elanus caeruleus leucurus

The white-tailed kite (Elanus leucurus) is a small raptor found in western North America and parts of South America. It replaces the related Old World black-winged kite in its native range.

Contents

Taxonomy

The white-tailed kite was described in 1818 by the French ornithologist Louis Pierre Vieillot under the binomial name Milvus leucurus with the type locality as Paraguay. [3] It is now one of four species in the genus Elanus which was introduced in 1809 by the French zoologist Jules-César Savigny. [4] The word Elanus is from Ancient Greek elanos for a "kite". The specific epithet leucurus is from the Ancient Greek leukouros for "white-tailed": leukos is "white" and oura is "tail". [5]

For some recent decades, it was lumped with the black-winged kite of Europe and Africa as Elanus caeruleus and was collectively called black-shouldered kite. [6] More recently it was argued that the white-tailed kite differed from the Old World species in size, shape, plumage, and behavior, and that these differences were sufficient to warrant full species status. [7] This argument was accepted by the American Ornithologists' Union, so the white-tailed kite was returned to its original name. Meanwhile, the Old World E. caeruleus is once again called black-winged kite, while the name black-shouldered kite is now reserved for an Australian species, Elanus axillaris, which had also been lumped into E. caeruleus but is now regarded as separate again.

Description

The coloration of the white-tailed kite is gull-like, but its shape and flight is falcon-like, with a rounded tail. Mainly white underneath, it has black wingtips and shoulders. A mid-sized kite, it measures 35–43 cm (14–17 in) in length, spans 88–102 cm (35–40 in) across the wings and weighs 250–380 g (8.8–13.4 oz). Both the wings and tail are relatively elongated, and the tarsus measures around 3.6 cm (1.4 in). [8]

White-tailed kite hovering. White-Tailed Kite.JPG
White-tailed kite hovering.
White-tailed kite roosting. Elanus leucurus.jpg
White-tailed kite roosting.

Distribution and habitat

The white-tailed kite was rendered almost extinct in California in the 1930s and 1940s due to shooting and egg-collecting, but they are now common again. Their distribution is patchy, however. They can be found in the Central Valley and southern coastal areas, open land around Goleta including the Ellwood Mesa Open Space, marshes in Humboldt County, and also around the San Francisco Bay. Elsewhere in California, they are still rare or absent. They are also found from southern Texas and eastern Mexico to the Baja California Peninsula and through Central and South America to central Argentina and Chile. Globally, they are not considered threatened species by the IUCN. [1] On rare occasions the bird can be found far outside its usual range. At different times, two had been sighted in New England as of 2010. [n 1]

Behaviour

White-tailed kites feed principally on rodents (as well as small opossums, shrews, reptiles, amphibians and large insects), [10] and they are readily seen patrolling or hovering over lowland scrub or grassland. They rarely if ever eat other birds, and even in open cerrado, mixed-species feeding flocks will generally ignore them. [11] Outside the breeding season during the winter, they roost communally in groups of up to 100. However, once mating formally begins with the construction of nests by both males and females in mid-February, the female kite abstains from hunting for the time being and stays in the nest to incubate the eggs while the male brings food back to the nest for the female and children. [12]

White-tailed kites have been observed in aerial combat at the margins of territories, locking talons in a behavior described as "grappling". [13]

Notes

  1. In August 2010, one was repeatedly seen at the mouth of the Housatonic River in Connecticut. "One of only two that we know of from New England", according to Frank Gallow, associate director of the Connecticut Audubon Society Coastal Center. [9]

Related Research Articles

<span class="mw-page-title-main">Kite (bird)</span> Bird of prey

Kite is the common name for certain birds of prey in the family Accipitridae, particularly in subfamilies Milvinae, Elaninae, and Perninae. The term is derived from Old English cȳta, from the Proto-Indo-European root *gū- , "screech."

<span class="mw-page-title-main">Black-winged kite</span> Raptor native to Eurasia

The black-winged kite, also known as the black-shouldered kite, is a small diurnal bird of prey in the family Accipitridae best known for its habit of hovering over open grasslands in the manner of the much smaller kestrels. This Palearctic and Afrotropical species was sometimes combined with the Australian black-shouldered kite and the white-tailed kite of North and South America which together form a superspecies. This kite is distinctive, with long wings; white, grey and black plumage; and owl-like forward-facing eyes with red irises. The owl-like behaviour is even more pronounced in the letter-winged kite, a nocturnal relative in Australia. Although mainly seen on plains, they are sometimes seen on grassy slopes of hills in the higher elevation regions of Asia. They are not migratory, but show nomadism in response to weather and food availability. They are well adapted to utilize periodic upsurges in rodent populations and can raise multiple broods in a single year unlike most birds of prey. Populations in southern Europe have grown in response to human activities, particularly agriculture and livestock rearing.

<span class="mw-page-title-main">Black-shouldered kite</span> Small raptor found in Australia

The black-shouldered kite, also known as the Australian black-shouldered kite, is a small raptor found in open habitats throughout Australia. It resembles similar species found in Africa, Eurasia and North America, including the black-winged kite, a species that has in the past also been called "black-shouldered kite". Measuring around 35 cm (14 in) in length, with a wingspan of 80–100 cm (31–39 in), the adult black-shouldered kite has predominantly grey-white plumage and prominent black markings above its red eyes. It gains its name from the black patches on its wings. The primary call is a clear whistle, uttered in flight and while hovering. It can be confused with the related letter-winged kite in Australia, which is distinguished by the striking black markings under its wings.

<span class="mw-page-title-main">Broad-winged hawk</span> Species of bird

The broad-winged hawk is a medium-sized hawk of the genus Buteo. During the summer, some subspecies are distributed over eastern North America, as far west as British Columbia and Texas; they then migrate south to winter in the Neotropics from Mexico south to southern Brazil. Other subspecies are all-year residents on Caribbean islands. As in most raptors, females are slightly larger than males. Broad-winged hawks' wings are relatively short and broad with a tapered, somewhat pointed appearance. The two types of coloration are a dark morph with fewer white areas and a light morph that is more pale overall. Although the broad-winged hawk's numbers are relatively stable, populations are declining in some parts of its breeding range because of forest fragmentation.

<span class="mw-page-title-main">Black wheatear</span> Species of bird

The black wheatear is a wheatear, a small passerine bird in the Old World flycatcher family Muscicapidae. It is found in southern Spain and western North Africa.

<i>Elanus</i> Genus of birds-of-prey

Elanus is a genus of bird of prey in the elanine kite subfamily. It was introduced by the French zoologist Jules-César Savigny in 1809 with the black-winged kite as the type species. The name is from the Ancient Greek elanos for a "kite".

<span class="mw-page-title-main">Elaninae</span> Subfamily of birds

An elanine kite is any of several small, lightly-built raptors with long, pointed wings.

<span class="mw-page-title-main">Plumbeous kite</span> Species of bird

The plumbeous kite is a bird of prey in the family Accipitridae that is resident in much of northern South America. It is migratory in the northern part of its range which extends north to Mexico. It feeds on insects which it catches either from a perch or while in flight.

<span class="mw-page-title-main">Swallow-tailed kite</span> Species of bird

The swallow-tailed kite is a pernine raptor which breeds from the southeastern United States to eastern Peru and northern Argentina. It is the only species in the genus Elanoides. Most North and Central American breeders winter in South America where the species is resident year round.

<span class="mw-page-title-main">Pearl kite</span> Species of bird

The pearl kite is a very small raptor found in open savanna habitat adjacent to deciduous woodland. It is the only member of the genus Gampsonyx. The scientific name commemorates the English naturalist William Swainson.

<span class="mw-page-title-main">Mississippi kite</span> Species of bird

The Mississippi kite is a small bird of prey in the family Accipitridae. Mississippi kites have narrow, pointed wings and are graceful in flight, often appearing to float in the air. It is common to see several circling in the same area.

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

The white-tailed hawk is a large bird of prey species found in tropical and subtropical environments of the Americas.

<span class="mw-page-title-main">Letter-winged kite</span> Raptor native to Australia

The letter-winged kite is a small, rare and irruptive bird of prey that is found only in Australia. Measuring around 35 cm (14 in) in length with a wingspan of 84–100 cm (33–39 in), the adult letter-winged kite has predominantly pale grey and white plumage and prominent black rings around its red eyes. Its name derives from its highly distinctive black underwing pattern of a shallow 'M' or 'W' shape, visible when in flight. This distinguishes it from the otherwise similar black-shouldered kite. This species is also the only nocturnal species within the order Accipitriformes despite few differences found in its visual anatomy to other closely related kites.

<span class="mw-page-title-main">Chestnut-vented warbler</span> Species of bird

The chestnut-vented warbler, chestnut-vented tit-babbler or rufous-vented warbler is an Old World warbler.

<span class="mw-page-title-main">Scissor-tailed kite</span> Species of bird

The scissor-tailed kite, also known as African swallow-tailed kite or fork-tailed kite, is a bird of prey in the monotypic genus Chelictinia in the family Accipitridae. It is widespread in the northern tropics of Africa.

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

The white-fronted falconet, also called the Bornean falconet, is a species of bird of prey in the family Falconidae. Described by the British ornithologist Richard Bowdler Sharpe in 1879, it is endemic to Borneo, where it is found in Sarawak, Sabah, and extreme northeastern Kalimantan. An extremely small falcon, it is only 14–17 cm (5.5–6.7 in) long and weighs 35–65 g (1.2–2.3 oz), being the smallest species of falconet. It has glossy bluish-black upperparts, black flanks and outer thighs, and a black mask. The belly and vent are pale yellowish-brown, while the throat, cheeks, and breast are white. The species can be told apart from other falconets by the colour of its crown and forehead, which is white in males and reddish-brown in females. It has no subspecies.

<span class="mw-page-title-main">Common black hawk</span> Species of bird

The common black hawk is a bird of prey in the family Accipitridae, which also includes the eagles, hawks, and vultures.

<span class="mw-page-title-main">Gray hawk</span> Species of raptor

The gray hawk or Mexican goshawk is a smallish raptor found in open country and forest edges. It is sometimes placed in the genus Asturina as Asturina plagiata. The species was split by the American Ornithological Society (AOU) from the gray-lined hawk. The gray hawk is found from Costa Rica north into the southwestern United States.

<span class="mw-page-title-main">Red-shouldered hawk</span> Species of bird

The red-shouldered hawk is a medium-sized buteo. Its breeding range spans eastern North America and along the coast of California and northern to northeastern-central Mexico. It is a permanent resident throughout most of its range, though northern birds do migrate, mostly to central Mexico. The main conservation threat to the widespread species is deforestation.

Nauclerus was a genus of birds of prey, containing the African and American swallow-tailed kites. Though similar, the two species are not closely related, belonging to separate subfamilies Elaninae and Perninae.

References

  1. 1 2 BirdLife International (2016). "Elanus leucurus". IUCN Red List of Threatened Species . 2016: e.T22695036A93486216. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22695036A93486216.en . Retrieved 13 November 2021.
  2. Gill F, D Donsker & P Rasmussen (Eds). 2020. IOC World Bird List (v10.2). doi : 10.14344/IOC.ML.10.2.
  3. Vieillot, Louis Pierre (1818). Nouveau dictionnaire d'histoire naturelle, appliquée aux arts, à l'agriculture, à l'économie rurale et domestique, à la médecine, etc (in French). Vol. 20. Paris: Deterville. p. 563. The page is incorrectly numbered as 556.
  4. Savigny, Jules-César (1809). Jomard, Edme-François (ed.). Description de l'Égypte, ou recueil des observations et des recherches qui ont été faites en Égypte pendant l'expédition de l'armée française, publié par les ordres de sa Majesté l'Empereur Napoléon le Grand (in French). Vol. 1. Paris: L'Imprimerie Impériale. pp. 69, 97–98.
  5. Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. pp.  144, 225. ISBN   978-1-4081-2501-4.
  6. Parkes, K.C. (1958). "Specific relationships in the genus Elanus" (PDF). Condor . 60 (2): 139–140. doi:10.2307/1365270. JSTOR   1365270.
  7. Clark, W.S.; Banks, R.C. (1992). "The taxonomic status of the White-tailed Kite" (PDF). The Wilson Journal of Ornithology . 104 (4): 571–579.
  8. Ferguson-Lees, James; Christie, David A.; Franklin, Kim; Mead, David; Burton, Philip (2001). Raptors of the World. Houghton Mifflin. ISBN   0-618-12762-3.
  9. Sanders, Jack (19 August 2010). "Bird Notes: Hummingbird antics and some rare visitors". The Ridgefield Press. Ridgefield, Connecticut.
  10. Ferguson-Lees, J. & Christie, D.A. & Franklin, K. & Mead, D. & Burton, P.. (2001). Raptors of the world. Helm Identification Guides.
  11. Ragusa-Netto, J. (2000). "Raptors and "campo-cerrado" bird mixed flock led by Cypsnagra hirundinacea (Emberizidae: Thraupinae)". Revista Brasileira de Biologia. 60 (3): 461–467. doi: 10.1590/S0034-71082000000300011 . hdl: 11449/28947 . PMID   11188872.
  12. Warner, J. Sauve; Rudd, Robert L. (July 1975). "Hunting by the White-Tailed Kite (Elanus leucurus)". The Condor. 77 (2): 226–230. doi:10.2307/1365804. ISSN   1938-5129. JSTOR   1365804.
  13. Whitt, Michael (1992). "Grappling in Black-shouldered Kites". Western Birds. Western Field Ornithologists. 23 (2): 81–83.