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Rüppell's vulture

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Rüppell's vulture
In the Masai Mara, Kenya
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Accipitriformes
Family: Accipitridae
Genus: Gyps
Species:
G. rueppelli
Binomial name
Gyps rueppelli
(Brehm, AE, 1852)
Subspecies[2]
  • G. r. rueppelli - (Brehm, AE, 1852)
  • G. r. erlangeri - Salvadori, 1908

Rüppell's vulture (Gyps rueppelli), also called Rüppell's griffon vulture, named after Eduard Rüppell, is a large bird of prey, mainly native to the Sahel region and East Africa. The former population of 22,000 has been decreasing due to loss of habitat, incidental poisoning, and other factors.[3] Known also as Rüppell's griffon, Rueppell's griffon, Rüppell's griffin vulture, Rueppell's vulture and other variants, it is not to be confused with a different species, the griffon vulture (Gyps fulvus).[4] Rüppell's vulture is considered to be the highest-flying bird, with confirmed evidence of a flight at an altitude of 11,300 m (37,000 ft) above sea level.[5]

Distribution

Rüppell's vulture in Nairobi National Park

Rüppell's vulture is distributed throughout the Sahel region and East Africa, where it inhabits grasslands, mountains, and woodlands. Once considered common in these habitats, it is experiencing steep declines, especially in the western portion of the range.[3]

Description

Skull without the rhamphotheca
Head of an adult

The Rüppell's vulture is a large vulture, noticeably outsizing the closely related white-backed vulture, with which they often occur in the wild. Adults are 85 to 103 cm (33 to 41 in) long,[3][6] with a wingspan of 2.26 to 2.6 m (7 ft 5 in to 8 ft 6 in), and a weight that ranges from 6.4 to 9 kg (14 to 20 lb).[3][7][8] Both sexes look alike: mottled brown or black overall with a whitish-brown underbelly and thin, dirty-white fluff covering the head and neck. The base of the neck has a white collar, the eye is yellow or amber, the crop patch deep brown. The head does not have feathers. This is an adaptation that occurred because of the Rüppell vulture's tendency to stick its head inside of its prey when eating. Without the adaptation, feeding would become extremely messy.[9] Silent as a rule, they become vocal at their nest and when at a carcass, squealing a great deal. Rüppell's vultures commonly fly at altitudes as high as 6,000 m (20,000 ft).[10] The birds have a specialized variant of the hemoglobin alphaD subunit; this protein has a great affinity for oxygen, which allows the species to absorb oxygen efficiently despite the low partial pressure in the upper troposphere.[11] A Rüppell's vulture was confirmed to have been ingested by a jet engine of an airplane flying over Abidjan, Ivory Coast on 29 November 1973 at an altitude of 11,300 m (37,000 ft).[5]

Behavior and ecology

Rüppell's vulture in Ethiopia

It cruises at a speed of 35 km/h (22 mph), but flies for 6–7 hours every day and as far as 150 km (93 mi) from a nest site to find food.[citation needed]

Feeding

At a blue wildebeest carcass in the Mara River at the Masai Mara National Reserve

Strictly a carrion feeder, the Rüppell's vulture has been known to follow game herds on their seasonal migrations and feeds in large numbers at carcasses, usually with other Old World vulture species. Though it might take advantage of the remains of an animal killed by a lion, or other large predator, it can also feed on animals that have died from injuries, disease, or old age. Though they prefer freshly-killed meat, they can eat older carcasses without a problem.[12] Rüppell's vultures have several adaptations to their diet and are specialized feeders even among the Old World vultures of Africa. They have an especially powerful build and, after the most attractive soft parts of a carcass have been consumed, they will continue with the hide, and even the bones, gorging themselves until they can barely fly. They have backward-pointing spikes on the tongue to help remove meat from bone. Despite their size, power and adaptations, they are not the most dominant vulture in their range, the most dominant species is considered to be the even larger lappet-faced vulture.[13]

Reproduction

Egg
Nestling

This species of vulture is considered to be monogamous, forming lifelong breeding pairs. After courtship the pair will work together to build a nest using sticks, grass, and leaves that they have gathered or stolen from other nests.[9] Rüppell's vultures build these nests on cliffs, and in key breeding areas they are known to nest in large colonies containing hundreds of breeding pairs. Both parents share in incubation of their egg over a period of 55 days. Once the chick hatches, both parents will feed and tend to it for about 150 days when it fledges.[9][14] Young remain dependent on their parents after fledging, not reaching independence until the next breeding season. During this time they learn how to find and compete for food.

Conservation

Since first being assessed by the International Union for Conservation of Nature in 1988, populations of Rüppell's vulture have decreased. The species has been listed with an IUCN Red List status of "near threatened" since 2007, and populations are estimated to decline.[1] From 2012 to 2014 the Rüppell's vulture was listed as Endangered; however, it was reassessed in 2015 as Critically Endangered.[1]

Rüppell's vulture is currently listed as an Appendix II species under CITES, which regulates the international trade of animals and plants.[1] Under this designation, the Rüppell's vulture is defined as not being immediately at risk of extinction, although the current population could become threatened without a careful regulation of trade.[15]

The total population of Rüppell's vulture has been estimated to be somewhere around 22,000 individuals, with specific populations in the following areas: Tanzania (3,000 pairs); Kenya (2,000 pairs); Ethiopia (2,000 pairs); Sudan (2,000 pairs); and West Africa (2,000 pairs).[1]

Since 1992, Rüppell's vulture has been occurring as a vagrant in Spain and Portugal, with annual records since 1997, mainly in the Cádiz and Strait of Gibraltar area, but also further north.[16]

Threats

Rüppell's vulture populations are experiencing declining populations throughout their entire range. These declines can be attributed to loss of habitat related to human-related land use, poisoning, human use for medicine or meat,[17] loss of nesting sites, and declining availability of food sources.[18] Poisoning is currently thought to be the most serious threat to all vulture populations in Africa, although they are not usually the intended target. In events where predators such as lions or hyenas have killed livestock, carbofuran poisons have been placed into carcasses as retaliation against the predators.[19] Vultures utilize carrion as their main food source, and one carcass has the potential to attract hundreds of birds to feed because this species identifies food by sight. One evaluation of 10 poisoning events found that each event caused the death of 37 to 600 individuals.[20]

Killing of Rüppell's vultures for use in medicine has also greatly contributed to the rapid population decline. In many African cultures, vultures are used for medicine and magic related to superstitions that they are clairvoyant and can be used to increase a child's intelligence.[19] Establishing protected wildlife areas is thought to be an effective route to protect the Rüppell's vulture from extinction. The Rüppell's vulture breed and nests in cliffs in northern and southern Kenya, as well as Tanzania. These breeding and nesting grounds amass huge numbers of Rüppell's vultures which will raise young and forage in the surrounding area.[21] Considering that the detection rate of Rüppell's vultures was found to be lower in protected areas than outside of them, extending protection to these key breeding sites could help support their population.[19]

See also

References

  1. ^ a b c d e BirdLife International (2021). "Gyps rueppelli". IUCN Red List of Threatened Species. 2021: e.T22695207A204723468. doi:10.2305/IUCN.UK.2021-3.RLTS.T22695207A204723468.en. Retrieved 14 February 2022.
  2. ^ Gill F, D Donsker & P Rasmussen (Eds). 2020. IOC World Bird List (v10.2). doi : 10.14344/IOC.ML.10.2.
  3. ^ a b c d "Rüppell's Vulture (Gyps rueppelli) - BirdLife species factsheet". www.birdlife.org. Archived from the original on 12 September 2015. Retrieved 29 February 2016.
  4. ^ Beolens, B.; Watkins, Michael (2003). Whose Bird? Men and Women Commemorated in the Common Names of Birds. London: Christopher Helm. p. 294.
  5. ^ a b Laybourne, Roxie C. (December 1974). "Collision between a Vulture and an Aircraft at an Altitude of 37,000 Feet" (PDF). The Wilson Bulletin. 86 (4): 461–462. ISSN 0043-5643. JSTOR 4160546. OCLC 46381512.
  6. ^ Field Guide to the Birds of East Africa: Kenya, Tanzania, Uganda, Rwanda, Burundi by Stevenson & Fanshawe. Elsevier Science (2001), ISBN 978-0856610790
  7. ^ Sinclair, I.; Hockey, P. (2005). Sasol: The Larger Illustrated Guide to Birds of Southern Africa. Illustrated by Norman Arlott and Peter Hayman (Second ed.). Cape Town: Struik Publishers. ISBN 978-1-77007-243-5.
  8. ^ Ferguson-Lees, C., Franklin, M. & Burton, H.M. (2001) Raptors of the World ISBN 0-618-12762-3
  9. ^ a b c "Ruppell's griffon vulture". Smithsonian's National Zoo. 2016. Retrieved 18 February 2018.
  10. ^ Scott, G. R. (2011). "Elevated performance: the unique physiology of birds that fly at high altitudes". Journal of Experimental Biology. 214 (15): 2455–2462. doi:10.1242/jeb.052548. PMID 21753038. S2CID 27550864.
  11. ^ Weber, RE; Hiebl, I; Braunitzer, G. (April 1988). "High altitude and hemoglobin function in the vultures Gyps rueppellii and Aegypius monachus". Biological Chemistry Hoppe-Seyler. 369 (4): 233–40. doi:10.1515/bchm3.1988.369.1.233. ISSN 0177-3593. PMID 3401328.
  12. ^ "Rüppell's Vulture | the Peregrine Fund".
  13. ^ "Rüppell's Griffon Vulture Gyps rueppelli". vultures.homestead.com. Archived from the original on 2 September 2007. Retrieved 12 December 2012.
  14. ^ "Rueppell's griffon videos, photos and facts - Gyps rueppellii". ARKive. Archived from the original on 22 March 2016. Retrieved 29 February 2016.
  15. ^ "The CITES Appendices | CITES". cites.org. Retrieved 29 February 2016.
  16. ^ Gutiérrez, R. (2003). "Occurrence of Rüppell's Griffon Vulture in Europe" (PDF). Dutch Birding. 25 (5): 289–303.
  17. ^ Thiollay, J.-M. (2006). "The decline of raptors in West Africa: long-term assessment and the role of protected areas". Ibis. 148 (2): 240–254. doi:10.1111/j.1474-919X.2006.00531.x.
  18. ^ Virani, M.Z.; Kendall, C.; Njoroge, P.; Thomsett, S. (2011). "Major declines in the abundance of vultures and other scavenging raptors in and around the Masai Mara ecosystem, Kenya". Biological Conservation. 144 (2): 746–752. doi:10.1016/j.biocon.2010.10.024.
  19. ^ a b c Ogada, D.L. (2014). "The power of poison: pesticide poisoning of Africa's wildlife". Annals of the New York Academy of Sciences. 1322 (1): 1–20. Bibcode:2014NYASA1322....1O. doi:10.1111/nyas.12405. PMID 24716788. S2CID 1185696.
  20. ^ Ogada, D.; Shaw, P.; Beyers, R.L.; Buij, R.; Murn, C.; Thiollay, J.M.; Beale, C.M.; Holdo, R.M.; Pomeroy, D. (2015). "Another Continental Vulture Crisis: Africa's Vultures Collapsing toward Extinction". Conservation Letters. 9 (2): 89–97. doi:10.1111/conl.12182. hdl:10023/8817.
  21. ^ Virani, M.Z.; Monadjem, A.; Thomsett, S.; Kendall, C. (2012). "Seasonal variation in breeding Rüppell's Vultures Gyps rueppellii at Kwenia, southern Kenya and implications for conservation". Bird Conservation International. 22 (3): 260–269. doi:10.1017/S0959270911000505.
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