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Black-winged Kite Elanus caeruleus Scientific name definitions

Alan C. Kemp, Guy M. Kirwan, Jeffrey S. Marks, Anna Motis, and Ernest Garcia
Version: 1.0 — Published March 4, 2020
Text last updated February 24, 2017

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Field Identification

30–37 cm (1); male 197–277 g, female 219–343 g; wingspan 77–92 cm (1). Distinctive black shoulder patches evident at all ages, when perched or in buoyant, gull-like flight; often hovers, and when perched pumps tail up and down . Only slight size difference between sexes, with female just 3% larger and up to 19% heavier (1). Pale primary-coverts on underwing separate from congeners. Juvenile browner, eye pale yellow not red. Races separated on size and intensity of plumage colour: wahgiensis smallest and has grey wash over sides of breast and blacker underside to primaries (like nominate); hypoleucus largest and longer-tailed, has larger white forehead patch, white breast-sides and flanks, underside to primaries paler and greyer (sometimes even whitish) and primary-coverts sometimes have larger, dark grey spots near tips; nominate and <em>vociferus</em> are similar in having small white forehead patch, breast-sides and flanks pale grey to off-white, blackish underside to primaries and primary-coverts have only greyish flecks at tips, but vociferus usually has a darker underside to the secondaries (1).

Systematics History

Editor's Note: This article requires further editing work to merge existing content into the appropriate Subspecies sections. Please bear with us while this update takes place.

Traditionally thought to form a species-group with E. axillaris and E. leucurus; all three sometimes considered conspecific, but differ variously in plumage, morphology and behaviour. Form hypoleucus has been treated as separate species; vociferus sometimes included in nominate (2). Race wahgiensis sometimes included in hypoleucus. Proposed races sumatranus (from Sumatra) and intermedius (Java) doubtfully separable from hypoleucus. Four subspecies normally recognized.

Subspecies


EBIRD GROUP (MONOTYPIC)

Black-winged Kite (African) Elanus caeruleus caeruleus Scientific name definitions

Distribution

SW France, N and W Iberian Peninsula, most of Africa and SW Arabia.

EBIRD GROUP (POLYTYPIC)

Black-winged Kite (Asian) Elanus caeruleus [vociferus Group]


SUBSPECIES

Elanus caeruleus vociferus Scientific name definitions

Distribution

Pakistan and much of Indian Subcontinent E to S China, Indochina and Malay Peninsula; this race also colonizing Israel (3), Jordan (4) and possibly areas farther E (Iraq and Iran, and NE and E Arabian Peninsula) (5).


SUBSPECIES

Elanus caeruleus hypoleucus Scientific name definitions

Distribution
Philippines, Greater Sundas, Sulawesi, Kalao (S of Sulawesi) and W and C Lesser Sundas (E to Timor).

SUBSPECIES

Elanus caeruleus wahgiensis Scientific name definitions

Distribution
New Guinea lowlands.

Distribution

Editor's Note: Additional distribution information for this taxon can be found in the 'Subspecies' article above. In the future we will develop a range-wide distribution article.

Habitat

Open savanna grasslands with scattered bushes and small trees; extends into arid steppe, desert or clearings in dense woodland, wherever prey is abundant. Presence of expanding population in Spain strongly associated with grazed, cultivated parklands called dehesas (6). Usually recorded from sea-level to 750 m in Europe, but to c. 2020 m in S Asia (7), 3000 m in Africa (1), and 2400 m in SW Arabia (8). Outside breeding season, up to 500 birds may roost communally in trees or reedbeds, spreading out by day to individual hunting territories.

Movement

Nomadic, ranging widely throughout its extensive range, in search of conditions supporting abundant prey; often travels long distances, and even crosses equator, e.g. from Transvaal (South Africa) to Malawi (9) and Uganda. Considerable monthly turnover, even in local populations which appear to be stable and sedentary, usually with males arriving first and remaining longest on territories, and females wandering in search of mates and nesting opportunities. Post-breeding dispersal is recorded in Iberian Peninsula, where the species is most widely distributed in winter although still concentrated in W & SW; a few individuals cross the Strait of Gibraltar (10). Vagrant N to Belgium (11), Netherlands, Denmark (12), Germany and Poland (11), as well as N Turkey, Kuwait, Lebanon, Syria (unconfirmed) (13), Uzbekistan, Afghanistan (14) and NE China (1); records in France, away from tiny breeding range (centred on Pyrénées-Atlantiques and Landes), have increased in recent decades presumably as a result of population growth in Iberia (15), with most extralimitals observed in Apr–May and Oct (11). Recently (Apr 1998 and Feb 2011) recorded for first time in Libya (16, 17). Records of birds at sea in Gulf of Aden and on Farasan Is, Red Sea, suggest movement between Africa and Arabia (where most records in Nov–Mar) (8), and has also been recorded twice recently on Maldives (Indian Ocean) (18) and four times in Madagascar (Sept 1988, Sept–Oct 1995) (19). Nominate race has also been recorded twice in SW Oman and several times in SW Saudi Arabia (17).

Diet and Foraging

Primarily rodents of 40–90 g (exceptionally up to 164 g) (1); shrews, bats, small birds (including doves, larks, pipits and emberizids) (1), reptiles and insects also predominate at times. S African study found that just three rodent species comprised 98% of diet and that breeding birds selected larger prey species that immatures and non-breeders; furthermore, larger prey became more important as breeding cycle progressed (20). Israeli breeders apparently heavily dependent on social voles (Microtus socialis guentheri) (3). In Sabah, Borneo, analysis of 597 pellets confirmed the following remains: Polynesian rat (Rattus exulans, 67%), short-horned grasshopper (Valanga nigricornis, 23%), unidentified small rodents (5%), Whitehead’s spiny rat (Maxomys whiteheadi, 2·7%), Asiatic rhinoceros beetle (Oryctes rhinoceros, 1·3%), south-east Asian white-toothed shrew (Crocidura fuliginosa, 0·8%) and White-breasted Waterhen (Amaurornis phoenicurus, 0·2%), while an additional 100 carcasses also included Malaysian house rats (Rattus rattus diardii, 61%) and common sun skink (Eutropis multifasciata, 6%) (21). Hunts from perch (tree, pole or wire) (1) or hovers, usually making a slow descent in stages, with wings held in high dihedral above the back and feet extended below, and ending with a fast plunge into ground cover. Hovers in still or windy conditions. Sometimes engages in fast gliding flight low above ground, and also hawks locusts and other winged insects in flight (1). Often crepuscular in hunting. Frequently consumes prey in flight, even including small mammals (1).

Sounds and Vocal Behavior

Generally, vocalizations are high-pitched and weak, and given most frequently in courtship and around nest, e.g. a piping “pee-oo” in contact between pair and also by male to advertise territory; also harsher “kree-uk” in aggression and a whistled scream in alarm (1).

Breeding

In Spain, copulation begins up to 44 days before onset of laying and may continue until 66 days after laying (22). Peak laying at start or end of summer or wet season in sub-Saharan Africa and India, but recorded in all months in opportunistic reaction to rodent availability, especially that of larger species; more seasonal in N Africa and S Europe, Feb–Apr, with young in nest until at least mid May (23), but even here, in SW France , clutches recorded in all months except Dec–Jan (24). Elsewhere, Jan–Jun in Malaysia; Mar–Apr and Sept–Dec in Sabah (Borneo) (25, 21); Apr and Aug in Sumatra; Aug and Oct in SW Arabia (8), Apr–Sept in Israel (3), mid Dec and May in Iraq (26), Jan in Senegal (27), Feb and Apr–Oct in Ethiopia (28), May–Oct in Uganda (29), May–Nov in Malawi (9), and peak Aug–Oct in SW South Africa (30). Male has butterfly-like courtship flight (1) and this is also used in territory defence against rival males (31). Generally monogamous, but sometimes sequentially polyandrous (30). Pair rapidly (7–13 days) (30) builds small, saucer-shaped platform (25–45 cm wide, exceptionally 150 cm) (30, 21) of sticks and weeds, lined with dry grass, in fork of upper branches of tree (including palms (26), eucalypts, poplars and pines (30), and sometimes obscured by ivy or mistletoe if constructed in deciduous tree) (31), bush or on electricity pylon, 0·75 (1)–25 m (26) above ground (usually 3–12 m) (1). Nests occasionally as close as c. 200 m apart, but territory size more usually 2·4–4·5 km² (32). Nests sometimes reused for successive clutches, but more commonly pair uses new nest (30). Usually 3–4 very variably marked (30) eggs (2–6), mean size 40 mm × 31 mm, laid at 1–3-day intervals (33); incubation 30–35 (1) days, usually starting with first egg and almost exclusively by female (30) (male may incubate for short periods to permit female to hunt) (31); chicks have pale grey-brown down after c. 1 week, but initially pinkish buff (33); fledging 30–40 (1) days and young may remain dependent for additional c. 12 weeks (1) (more usually 20–60 days) (31); may rear multiple broods in succession (e.g. seven attempts in 19 months) and up to four per year in SW France (24), in some cases with male taking over all feeding of fledglings (typically male provisions female, which then feeds chicks) (31), and female starting new clutch with a different mate. Breeding output of small French population subject to detailed appraisal: success rate of first clutch just 37·28%, largely due to unfavorable early spring climate, but rises to 60% for second (or replacement) clutch, and clutches following successful breeding effort proved more likely to succeed (75%), while the mean success rate overall is 51·28% with productivity of 1·15 juveniles per attempt and 2·25 per successful breeding (24).

Not globally threatened (Least Concern). CITES II. One of the commonest birds of prey throughout its wide range, e.g. estimated 44,000 pairs in Transvaal alone. Widespread and fairly common in parts of E Africa (1). In Borneo, rare in N, but widespread and locally common in Kalimantan, although some evidence of decline there (25); decreasing in Java (1); now rare in Philippines (34); rare in NE India, where just two records in Nagaland (35); locally fairly common in Thailand and Sumatra; common in Nam Cat Tien National Park (S Vietnam) in mid 1980s. Perhaps in process of colonizing extreme S Japan, where first recorded in mid 1990s, and has recently bred on Ishigaki, in S Nansei Shoto. Patchily distributed in some areas, notably India, Iberia and NW Africa. The species was first reported in Iberia in the mid 19th century (10), where breeding was apparently confined to S Portugal until the early 1970s, when breeding was first reported in Toledo province, in 1973) (10). In early 1990s (1), there were an estimated 150–200 pairs in Portugal and c. 1000 (1) pairs estimated in Spain, where it has since increased and spread, although the core population remains in W & SW Iberia. Range has also expanded into SW France (11), where first records in the 1980s, first breeding proven in 1990 (36), 16 pairs censused in 2004 (24), 166–126 pairs in 2012 (37) and 130–150 pairs in 2014 (38). In N Africa, local in Morocco (39) and Algeria, and was declining in Tunisia (1) until 1990s, but has more recently expanded its range (40). One of few species to prosper in areas of agriculture, bush clearing and heavy grazing, e.g. along R Nile; currently in expansion in several parts of range, e.g. in Egypt, where historically widespread and common, declined during mid-20th century, but started increasing again in 1980s (41). Recent spate of records of race vociferus in Israel culminated in five pairs breeding in 2011–2012 (3), which had increased to 130–150 pairs by early 2016 (17); in neighbouring Jordan, at least nine records also of vociferus, all since 2013, and some evidence of breeding (4). First nesting record in SE Turkey in spring 2013 (42), with perhaps ten pairs now breeding (17). SW Arabian population estimated at just 10–20 pairs, but appears to be colonizing E parts of the Peninsula (e.g., nine records in Oman in recent years and first in Saudi Arabia’s Eastern Province in Mar 2012) (43), as well as Iraq (where first recorded in 2001, since discovered breeding and believed to be expanding its range) (26, 17) and Iran (first recorded 1998 (44) and apparently now an established breeder in C & S of the country) (45, 17). Uncommon in Somalia, where status poorly understood and known only from extreme NW & S (46). Mobility and reproductive biology ensure optimum use of resources, repeated colonization of ephemeral or marginal habitats, high fecundity and maintenance of large megapopulations. In South Africa, prone to being killed by vehicles, presumably because of high foraging activity on or adjacent to roads (47). Affected locally by rodenticides.

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Black-winged Kite

Elanus caeruleus

Abundance

Relative abundance is depicted for each season along a color gradient from a light color indicating lower relative abundance to a dark color indicating a higher relative abundance. Relative abundance is the estimated average count of individuals detected by an eBirder during a 1 hour, 1 kilometer traveling checklist at the optimal time of day for each species.   Learn more about this data

Relative abundance
Year-round
0.01
0.08
0.29

Recommended Citation

Kemp, A. C., G. M. Kirwan, J. S. Marks, A. Motis, and E. F. J. Garcia (2020). Black-winged Kite (Elanus caeruleus), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.bkskit1.01
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