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, someone who studies birds, 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.[4] However, the American Ornithologists’ Union accepted a more recent argument 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.[5] Thus, 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. While it has white faces and white underparts, it has black wingtips, beaks, and shoulders. Contrastingly, the white-tailed kite has deep red eyes that stand out at night. [6] 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). [7]

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 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. Although they are not migratory birds, 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]

White-tailed kites typically nest at the top of trees, usually around 20 to 50 feet above ground level. These nests can be in open-country trees growing in isolation, or at the edge of or within a forest. Their nests are built from medium-sized sticks and twigs, grasses, weeds, hay, and moss and are measured about 21 inches across with a cup that is around 7 inches across and 4 inches deep. [9]

Behaviour

The white-tailed kite is famously known for “kiting,” hovering in a position by facing into the wind and fluttering its wings. Although it may seem like irrelevant behavior at first, it does serve a purpose for hunting. While hovering around 80 feet in the air, it tips its head down to look for small mammals moving in the grass below. When prey is spotted, it dives down, quickly grabs the animal with its talons, and flies back up to eat. [10]

White-tailed kites feed principally on rodents (as well as small opossums, shrews, reptiles, amphibians and large insects), [11] 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. [12] Most of the hunted insects are consumed on the wing while flying. This means that instead of returning to a perch to feed, these birds transfer the prey from their talons to their beaks while flying to eat. In the case of larger prey such as rodents and lizards, they will fly to a perch to pluck and eat. [13]

Outside the breeding season during the winter, they roost, congregate or settle to rest at night, 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. [14] This incubation period lasts around 26-32 days and they lay around 4 to 5 eggs at a time. Their eggs are cream-colored with splotches of light and dark brown. Once they have hatched, it takes them around 35-40 days to develop the proper feathers and start learning how to fly. [15]

White-tailed kites have been observed in aerial combat at the margins of territories, locking talons in a behavior described as "grappling". [16] This is most often done during mating season as an act of dominance when the male Kite patrols the nest. They will typically slash and peck at intruding birds until one of the birds backs down or falls.

Threats

Their predators are primarily other birds like red-tailed hawks, peregrine falcons, prairie falcons, and great-horned owls. Meanwhile, smaller birds like American crows, common ravens, and small to medium-sized carnivores will go for the eggs of white-tailed kites. [17]

Deforestation and urban expansions have caused the number of white-tailed kites to decrease as they lose suitable places to live and truly thrive. Climate change also impacts the white-tailed kite population as heat waves in the spring put young birds at risk as their bodies are not developed enough to properly regulate their body temperature and can die from dehydration.

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. [8]

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 the subfamilies Elaninae and Perninae and certain genera within Buteoninae. The term is derived from Old English cȳta, possibly from the onomatopoeic 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. Now present in SouthWest France

<span class="mw-page-title-main">Northern shrike</span> Species of bird

The northern shrike is a large songbird species in the shrike family (Laniidae) native to North America and Siberia. Long considered a subspecies of the great grey shrike, it was classified as a distinct species in 2017. Six subspecies are recognised.

<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.

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The blue-gray gnatcatcher is a very small gnatcatcher native to North America.

<span class="mw-page-title-main">Eastern kingbird</span> Species of bird

The eastern kingbird is a large tyrant flycatcher native to the Americas. The bird is predominantly dark gray with white underbelly and pointed wings. Eastern kingbirds are conspicuous and are commonly found in open areas with scattered trees and bushes, where they perch while foraging for insects. The Eastern kingbird is migratory, with its breeding range spread across North America and its wintering range in Central and South America.

<span class="mw-page-title-main">Acadian flycatcher</span> Species of bird

The Acadian flycatcher is a small insect-eating bird of the tyrant flycatcher family.

<span class="mw-page-title-main">Say's phoebe</span> Species of bird

Say's phoebe is a passerine bird in the tyrant flycatcher family, Tyrannidae. A common bird across western North America, it prefers dry, desolate areas. It was named for Thomas Say, an American naturalist.

<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">Chestnut-collared longspur</span> Species of bird

The chestnut-collared longspur is a species of bird in the family Calcariidae. Like the other longspurs, it is a small ground-feeding bird that primarily eats seeds. It breeds in prairie habitats in Canada and the northern United States and winters to the south in the United States and Mexico.

<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">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.

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References

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  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.
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  15. "Life history account for White-tailed Kite". California Department of Fish and Wild Life. 1990.
  16. Whitt, Michael (1992). "Grappling in Black-shouldered Kites". Western Birds. 23 (2). Western Field Ornithologists: 81–83.
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