Black eagle

The black eagle. Like all eagles, it is in the family Accipitridae, and is the only member of the genus Ictinaetus. They soar over forests in the hilly regions of tropical and subtropical South and Southeast Asia, as well as southeastern China. They hunt mammals and birds, particularly at their nests. They are easily identified by their widely splayed and long primary "fingers", the characteristic silhouette, slow flight and yellow ceres and legs that contrast with their dark feathers.

This article is about the south and southeast Asian bird. For the African and west Asian bird, see Verreaux's eagle. For other uses, see Black eagle (disambiguation).

Black eagle
The wing tip reaches the tail at rest (ssp. perniger)

Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Accipitriformes
Family: Accipitridae
Genus: Ictinaetus
Blyth, 1843
Species:
I. malaiensis
Binomial name
Ictinaetus malaiensis
(Temminck, 1822)
Synonyms
  • Neopus malayensis
  • Ictinaetus malayensis
  • Aquila pernigra

Taxonomy and systematics

The species name is spelt malayensis in most publications but the original spelling used by Temminck in his description uses the spelling malaiensis according to a 2011 finding of some of the original covers of the part publications leading to taxonomists applying the principle of priority and rejecting any later spelling emendations.[2]

Description
Flight silhouette showing narrowing at the base of wing

The black eagle is a large but slender eagle, at about 75 cm (30 in) in length and 148 to 182 cm (4 ft 10 in to 6 ft 0 in) in wingspan. Despite its large appearance (it is one of the largest eagles in its range), known weights are relatively modest, at between 1,000 and 1,600 g (2.2 and 3.5 lb), about half the weight of the partially sympatric mountain hawk-eagle, the latter being of a similar total length. Adults have all-black plumage, with a yellow bill base (cere) and feet. The wings are long and pinched in at the innermost primaries giving a distinctive shape. The tail shows faint barring and upper tail covers are paler. When perched the wing tips reach till or exceed the tail tip. The wings are held in a shallow V (wings just above the horizontal plane) in flight. Seen on hot afternoons, scouring the treetops for a nest to maraud, this bird is easily spotted by its jet black colour, large size, and a characteristic slow flight, sometimes just above the canopy.[3]

Sexes are similar, but young birds have a buff head, underparts and underwing coverts. The wing shape helps to distinguish this species from the dark form of changeable hawk-eagle, (Nisaetus cirrhatus). The tarsi are fully feathered and the toes are relatively stout and short with long claws (particularly on the inner toe[4]) that are less strongly curved than in other birds of prey.[5]

Distribution and habitat

The black eagle breeds in tropical and subtropical Asia. Race perniger (Hodgson, 1836) is found in the Himalayan foothills west through Nepal into the Indian states of Himachal Pradesh and Jammu & Kashmir, and in the forests of the Eastern and Western Ghats in peninsular India and Sri Lanka.[6][7][8] The bird's westernmost extent is from Gujarat, especially in the forested areas in southern and eastern Gujarat.[9] The species also extends into the Aravalli range of northwestern India.[10] The nominate race malaiensis (Temminck, 1822) is found in Burma, southern China (Yunnan, Fujian) and Taiwan, into Southeast Asia. They are generally residents and no migrations have been observed.[11] In a study in southern India, it was found to favour forests with good forest cover and was absent from areas where the cover was less than 50%.[12]

Behaviour and ecology
The primaries are long and well splayed out in slow flight

Breeding

The courtship display involves steep dives with folded wings with swoops up in a U shape into a vertical stall.[3] They build a platform nest, 3 to 4 feet wide, on a tall tree overlooking a steep valley. One or two white eggs which are blotched in brown and mauve may be laid during the nesting season between January and April.[13][14][15] The nest site may be reused year after year.[5]

Food and feeding

The black eagle eats mammals (including bats[16], squirrels and other small mammals), birds and eggs. It is a prolific nest-predator and is known for its slow flight just over the canopy.[3] The curved claws and wide gape allow it to pick up eggs of birds from nests as well as swiftlets from caves.[17][16] Along with swallow-tailed kites they share the unique habit of carrying away an entire nest with nestlings to a feeding perch.[18] Squirrels, macaques and many species of birds emit alarm calls when these birds are spotted soaring over the forest. The Indian giant squirrel has been noted as a prey of this species[19] and young bonnet macaques may also fall prey to them.[20]

Threats and survival

It is not threatened but uncommon in large areas in its distribution. Shrinking of forested areas due to large-scale extraction has reduced its earlier range.

Relationship to humans

Due to this eagle's ability to remain aloft for long periods with minimal effort, the Lepcha people of India's Darjeeling district described it as a bird that never sat down, while the Soliga people's name (Kaana Kattale ) recalls its black colour and its presence in relatively forested areas .[21][22]

gollark: You'd have to keep decreasing it for every repost though.
gollark: I didn't. Depending on how it gets split into blocks or something it might work.
gollark: Based on something or other it runs on perceptual hashes which use a discrete cosine transform thingy, so it might be easiest to DCT the image data, fiddle with the parameters a bit, and convert it back.
gollark: I should really work on trying to evade meme repost detection again. I think I determined that rotation past about 15 degrees got around it but was very obvious, and adding small amounts of noise didn't.
gollark: https://media.discordapp.net/attachments/549759333014044673/776531971193962526/unknown.png

References
  1. BirdLife International (2012). "Ictinaetus malayensis". IUCN Red List of Threatened Species. 2012. Retrieved 26 November 2013.CS1 maint: ref=harv (link)
  2. Lebossé, A. & Bour, R. (2011). "The first twenty livraisons of "Les Planches Coloriées d'Oiseaux" of Temminck & Laugier (1820‐1839): I. The ten wrappers now known". Zoological Bibliography. 1 (4): 141‐150.
  3. Rasmussen, P.C. & J.C. Anderton (2005). Birds of South Asia: The Ripley Guide. Vol. 2. Smithsonian Institution & Lynx Edicions. p. 104.
  4. Hodgson, B.H. (1843). "Description of a new genus of Falconidae". Journal of the Asiatic Society of Bengal: 127–128.
  5. Ali S & SD Ripley (1978). Handbook of the birds of India and Pakistan. 1 (2nd ed.). Oxford University Press. pp. 283–285.
  6. Prater, S.H. (1940). "The Indian Black Eagle (Ictinaetus malayanus perniger Hodgs.) in Salsette". J. Bombay Nat. Hist. Soc. 41 (4): 899.
  7. Rao, VUS (1968). "The Black Eagle Ictinaetus malayensis perniger within Bombay limits". Newsletter for Birdwatchers. 8 (12): 6–7.
  8. Burgess, H.E. (1937). "Eagles on the Nilgiris". J. Bombay Nat. Hist. Soc. 39 (2): 399–403.
  9. Parasharya, B. M. (27 February 2010). "Black Eagle Ictinaetus malayensis at Narmada Dam, Gujarat". Indian Birds. 6: 95–96 – via Research Gate.
  10. Dharmakumarsinhji, KS (1985). "The Black Eagle Ictinaetus malayensis Temm. at Sawai Madhopur, (Rajasthan)". J. Bombay Nat. Hist. Soc. 82 (3): 655.
  11. Tordoff, A.W. (2002). "Raptor migration at Hoang Lien Nature Reserve, northern Vietnam" (PDF). Forktail. 18: 45–48. Archived from the original (PDF) on 2011-06-10.
  12. Thiollay, Jean-Marc (1993). "Response of a Raptor Community to Shrinking Area and Degradation of Tropical Rain Forest in the South Western Ghats (India)". Ecography. 16 (2): 97–110. doi:10.1111/j.1600-0587.1993.tb00062.x.
  13. Buchanan, Kenneth (1899). "Nesting of the Black Eagle". J. Bombay Nat. Hist. Soc. 12 (4): 776–777.
  14. Daly, W Mahon (1899). "Nesting of the Black Eagle". J. Bombay Nat. Hist. Soc. 12 (3): 589.
  15. Baker, ECS (1918). "Notes on the nidification of some Indian Falconidae. III. the genera Ictinaetus and Microhierax". Ibis. 60 (1): 51–68. doi:10.1111/j.1474-919X.1918.tb00770.x.BHL
  16. Smythies, Bertram (1968). The Birds of Borneo (2nd edn). Oliver and Boyd: Edinburgh. ISBN 9780050015308.
  17. Nijman, V (2004). "Seasonal variation in naturally occurring mobbing behavior of drongos (Dicruridae) towards two avian predators". Ethology Ecology & Evolution. 16: 25–32. doi:10.1080/08927014.2004.9522651. Archived from the original (PDF) on 2011-10-01. Retrieved 2009-04-10.
  18. Coulson, Jennifer O. (2001). "Swallow-tailed Kites Carry Passerine Nests Containing Nestlings to Their Own Nests". The Wilson Bulletin. 113 (3): 340–342. doi:10.1676/0043-5643(2001)113[0340:STKCPN]2.0.CO;2.
  19. Borges, Renee (1986). "Predation attempt by Black Eagle (Ictinaetus malayensis perniger) on Indian Giant Squirrel (Ratufa indica elphinstonii)". J. Bombay Nat. Hist. Soc. 83: 203.
  20. Ali, Rauf (1986). "Feeding ecology of the Bonnet Macaque at the Mundanthurai Sanctuary, Tamil Nadu". J. Bombay Nat. Hist. Soc. 83 (1): 98–110.
  21. Swann, H. Kirke (1924–1945). Alexander Wetmore (ed.). A Monograph of the Birds of Prey (Order Accipitres), Part XI. Wheldon & Wesley, London. p. 93.
  22. Srinivas, Prashanth. "Soligas: the people of the forest". JLRExplore. Retrieved 23 December 2018.

Historical publications
  • Illustration and description (in French) by Temminck (Pl. Col. vol. 1, plate 117, pages 104–105.)
  • 1836 original description of Nepalese race as Aquila Pernigra by B. H. Hodgson (now a subspecies I. m. perniger).
  • 1843 proposal of new genus Heteropus by Hodgson, separated from Aquila based on the unusual form of the black eagle's foot. With a footnote by Blyth noting that Jerdon had sent specimens to the museum labeled Ictinaëtus ovivorus. Text and illustration.
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