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Bearded vulture

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Bearded Vulture
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Aves
Order:
Falconiformes
(or Accipitriformes, q.v.)
Family:
Accipitridae
Subfamily:
Aegypiinae
Genus:
Gypaetus

Storr, 1784
Species:
G. barbatus
Binomial name
Gypaetus barbatus

The Bearded Vulture (Gypaetus barbatus), also known as the Lammergeier or Lammergeyer, is a bird of prey, the only member of the genus Gypaetus. Traditionally considered an Old World vulture, it actually forms a minor lineage of Accipitridae together with the Egyptian Vulture (Neophron percnopterus), its closest living relative. They are not much more closely related to the Old World vultures proper than to, for example, hawks, and differ from the former by their feathered neck. Although dissimilar, Egyptian and Bearded Vultures both have a lozenge-shaped tail that is unusual among birds of prey.

It eats mainly carrion and lives and breeds on crags in high mountains in southern Europe, North Africa, Southern Africa,[2] the Indian Subcontinent, and Tibet, laying one or two eggs in mid-winter which hatch at the beginning of spring. Populations are resident.

Description

Unlike most vultures, the Lammergeier does not have a bald head. This huge bird is 94–125 cm (37–49 in) long with a wingspan of 2.31–2.83 m (7.6–9.3 ft) [3], and is quite unlike most other vultures in flight due to its large, narrow wings and long, wedge-shaped tail, which measures 43–52 cm (17–20 in) in length. It weighs 4.5–7.8 kg (9.9–17.2 lb), with the nominate race averaging 6.21 kg (13.7 lb) and G. b. meridionalis averaging 5.7 kg (13 lb). Females are slightly larger than males.[4][5]

The adult has a buff-yellow body and head, the latter with the black moustaches which give this species its alternative name. It may rub mud over its chin, breast and leg feathers, giving these areas a rust-coloured appearance. The tail feathers and wings are grey. The juvenile bird is dark all over, and takes five years to reach full maturity. The Lammergeier is silent, apart from shrill whistles at the breeding crags, and can live up to 40 years in captivity.

  • Nestlings are covered in dark down feathers
    Nestlings are covered in dark down feathers
  • The juvenile bird is mostly dark
    The juvenile bird is mostly dark
  • The adult has a buff-yellow body and head
    The adult has a buff-yellow body and head
  • Adult in flight from below (note the peculiar tail shape)
    Adult in flight from below (note the peculiar tail shape)

Behaviour

Boy with live Bearded Vulture, Kabul, 1973.

Like other vultures it is a scavenger, feeding mostly from carcasses of dead animals. It usually disdains the rotting meat, however, and lives on a diet that is 90% bone marrow. The Lammergeier can swallow whole bones up to the size of a lamb's femur[6] and its powerful digestive system quickly dissolves even large pieces. The Lammergeier has learned to crack bones too large to be swallowed by carrying them up to a height and then dropping them onto rocks below, smashing them into smaller pieces and exposing the nutritious marrow. This learned skill requires extensive practice by immature birds and takes up to seven years to master.[7] Its old name of Ossifrage ("bone breaker") relates to this habit. Live tortoises are also dropped in similar fashion to crack them open. Although dropping bones is a regular habit, the Lammergeier also obtains food by other means and has been known to seize and carry off live prey such as a two foot monitor lizard.[6]

Physiology

The acid concentration of the Lammergeier stomach has been estimated to be of pH about 1 and large bones will be digested in about 24 hours, aided by slow mixing/churning of the stomach content. The high fat content of bone marrow makes the net energy value of bone almost as good as that of muscle, even if bone is less completely digested. A skeleton left on a mountain will dehydrate and become protected from bacterial degradation and the Lammergeier can return to consume the remainder of a carcass even months after the soft parts have been consumed by other animals, larvae and bacteria.[8]

Habitat

The habitat is exclusively mountainous terrain (500–4,000 m (1,600–13,100 ft)*). An individual has been seen at 24,000 feet (7,300 m).[9] The bird breeds from mid-December to mid-February, laying 1 to 2 eggs which hatch between 53 and 58 days. After hatching the young spend 106 to 130 days in the nest before fledging. Typically, the Lammergeier nests in caves and on ledges and rock outcrops.[6]

  • Gypaetus barbatus aureus egg
    Gypaetus barbatus aureus egg
  • Gypaetus barbatus hemachalanus egg
    Gypaetus barbatus hemachalanus egg

Conservation status

Although the Lammergeier is threatened within its range in Europe, the species has a large range across Asia and Africa and is relatively common across much of that range. As such the species is listed as least concern on the IUCN Red List, although there is some evidence of decline. It was formerly killed in significant numbers because people feared (without justification) that it carried off children and domestic animals; the bird was also hunted as a trophy.[10]

Etymology

This species was first described by Linnaeus in his Systema naturae in 1758 as Vultur barbatus.[11] The present scientific name means "Bearded Vulture-Eagle".

The name of the Lammergeier originates from German Lämmergeier, which means "lamb-vulture" or "lamb-hawk". The name stems from the belief that it attacked lambs.[12]

Legend

The Greek playwright Aeschylus was said to have been killed in 456 or 455 BC by a tortoise dropped by an eagle who mistook his bald head for a stone – if this incident did occur, the Lammergeier is a likely candidate for the "eagle".

More recently, in 1945, it is said that Shimon Peres (called Shimon Persky at the time) and David Ben-Gurion found a nest of Bearded Vultures in the Negev desert. The bird is called peres in Hebrew, and Shimon Persky liked it so much he adopted it as his surname.[13]

Bearded Vulture is considered a threatened species in Iran. Iranian mythology considers the rare Lammergeier the symbol of luck and happiness. It was believed that if the shadow of a Huma fell on one, he would rise to sovereignty.[14]

References

  1. ^ Template:IUCN
  2. ^ http://www.africanraptors.org/conservation-of-the-bearded-vulture-gypaetus-barbatus-meridionalis-by-sonja-kruger/
  3. ^ Animal Diversity Web
  4. ^ Ferguson-Lees, James; Christie, David A. (2001). Raptors of the World. Illustrated by Kim Franklin, David Mead, and Philip Burton. Houghton Mifflin. ISBN 978-0-618-12762-7. Retrieved 2011-05-29417. {{cite book}}: Check date values in: |accessdate= (help)
  5. ^ Beaman, Mark; Madge, Steve (1999). The Handbook of Bird Identification for Europe and the Western Palearctic. Princeton University Press. ISBN 978-0-691-02726-5.
  6. ^ a b c "The Living Edens — Bhutan — Lammergeier Vulture". PBS. Retrieved 2011-05-30.
  7. ^ "Lammergeier (video, facts and news)". Wildlife Finder. BBC. Retrieved 2011-05-29.
  8. ^ "Bone Digestion and Intestinal Morphology of the Bearded Vulture" (PDF). J. Raptor Res. 28 (2). Raptor Research Foundation: 73–78. 1994. Retrieved 2011-07-24. {{cite journal}}: Unknown parameter |authors= ignored (help)
  9. ^ Bruce, Charles Granville (1923). The assault on Mount Everest 1922. London: Longmans, Green and Co.
  10. ^ "Lammergeier". howstuffworks.com. Discovery Communications. 2008-04-22. Retrieved 2011-05-29.
  11. ^ Linnaeus, Carolus (1758). Systema naturae per regna tria naturae, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis. Tomus I. Editio decima, reformata (in Latin). Holmiae. (Laurentii Salvii). p. 87. V. albidus, dorso fusco, jugulo barbato, rostro incarnato, capite linea nigra cincto.
  12. ^ Everett, Mike (2008). "Lammergeiers and lambs". British Birds. 101 (4): 215.
  13. ^ Marche, Stephen (2008-06-13). "Flight of Fancy". The New Republic. Retrieved 2011-05-31.
  14. ^ Pollard, J. R. T. (1947). "The Lammergeyer: Comparative Descriptions in Aristotle and Pliny". Greece & Rome. 16 (46): 23–28. ISSN 1477-4550.
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