Leptoptilos

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Leptoptilos
Temporal range: Late Miocene to Recent
Marabou Stork Standing Lupande Jul23 A7R 06322.jpg
Marabou stork near South Luangwa National Park, Zambia
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Ciconiiformes
Family: Ciconiidae
Genus: Leptoptilos
Lesson, RP, 1831
Type species
Ardea argala = Ardea dubia
Latham, 1790
Species

L. crumenifer
L. dubius
L. javanicus

Synonyms

Cryptociconia

Leptoptilos is a genus of very large tropical storks, commonly known as adjutants. The name means thin (lepto) feather (ptilos). Two species are resident breeders in southern Asia, and the marabou stork is found in Sub-Saharan Africa.

Contents

These are huge birds, typically 110–150 cm tall with a 210–250 cm wingspan. The three species each have a black upper body and wings, and white belly and undertail. The head and neck are bare like those of a vulture. The huge bill is long and thick. Juveniles are a duller, browner version of the adult.

Leptoptilos storks are gregarious colonial breeders in wetlands, building large stick nests in trees. They feed on frogs, insects, young birds, lizards and rodents. They are frequent scavengers, and the naked head and neck are adaptations to this, as are those of the vultures with which they often feed. A feathered head would become rapidly clotted with blood and other substances when a scavenging bird's head was inside a large corpse, and the bare head is easier to keep clean.

Most storks fly with neck outstretched, but the three Leptoptilos storks retract their necks in flight like a heron.

Taxonomy and species

The genus Leptoptilos was introduced in 1831 by the French naturalist René Lesson. [1] The genus name combines the Ancient Greek leptos meaning "delicate" or "slender" with ptilon meaning "feather". [2] The type species was subsequently designated as the greater adjutant by George Robert Gray. [3] [4]

The genus contains three extant species. [5]

Genus Leptoptilos Lesson, RP, 1831 – three species
Common nameScientific name and subspeciesRangeSize and ecologyIUCN status and estimated population
Marabou stork

Leptoptilos crumenifer00.jpg

Leptoptilos crumenifer
(Lesson, RP, 1831)
Africa south of the Sahara
Leptoptilos crumeniferus distribution map.png
Size:

Habitat:

Diet:
 LC 


Lesser adjutant

Lesser Adjutant ,Yala National Park .jpg

Leptoptilos javanicus
(Horsfield, 1821)
South and Southeast Asia, from India and Sri Lanka to IndonesiaSize:

Habitat:

Diet:
 NT 


Greater adjutant

Greater Adjutant Leptoptilos dubius by Dr. Raju Kasambe (1).JPG

Leptoptilos dubius
(Gmelin, JF,, 1789)
northern India to mainland southeast Asia
LeptoptilosDubiusMap.svg
Size:

Habitat:

Diet:
 NT 



Fossils

There is an ample fossil record of this genus. Many fossils members of the genus were much larger than living species, standing as tall as a man, with the earliest being Leptoptilos falconeri from the Pliocene of Afro-Eurasia. Giant Leptoptilos storks survived into the Late Pleistocene on the Southeast Asian islands of Java (L. titan) and Flores (L. robustus). [6]

Leptoptilos siwalicensis from the Siwalik deposits (Late Miocene? to Late Pliocene) may belong to this genus or to a closely related one (Louchart et al. 2005).

In culture

The adjutant bird features in the arms of Baron Sinha. In the satirical French puppet show Le Bébête Show , Valéry Giscard d'Estaing was, for a time, depicted as a Leptoptilos.

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<span class="mw-page-title-main">Marabou stork</span> Species of bird

The marabou stork is a large wading bird in the stork family Ciconiidae native to sub-Saharan Africa. It breeds in both wet and arid habitats, often near human habitation, especially landfill sites. It is sometimes called the "undertaker bird" due to its shape from behind: cloak-like wings and back, skinny white legs, and sometimes a large white mass of "hair".

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<span class="mw-page-title-main">Greater adjutant</span> Species of bird

The greater adjutant is a member of the stork family, Ciconiidae. Its genus includes the lesser adjutant of Asia and the marabou stork of Africa. Once found widely across southern Asia and mainland southeast Asia, the greater adjutant is now restricted to a much smaller range with only three breeding populations; two in India, with the largest colony in Assam, a smaller one around Bhagalpur; and another breeding population in Cambodia. They disperse widely after the breeding season. This large stork has a massive wedge-shaped bill, a bare head and a distinctive neck pouch. During the day, it soars in thermals along with vultures with whom it shares the habit of scavenging. They feed mainly on carrion and offal; however, they are opportunistic and will sometimes prey on vertebrates. The English name is derived from their stiff "military" gait when walking on the ground. Large numbers once lived in Asia, but they have declined to the point of endangerment. The total population in 2008 was estimated at around a thousand individuals. In the 19th century, they were especially common in the city of Calcutta, where they were referred to as the "Calcutta adjutant" and included in the coat of arms for the city. Known locally as hargila and considered to be unclean birds, they were largely left undisturbed but sometimes hunted for the use of their meat in folk medicine. Valued as scavengers, they were once depicted in the logo of the Calcutta Municipal Corporation.

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<i>Leptoptilos robustus</i> Extinct species of stork

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Leptoptilos falconeri is an extinct species of large-bodied stork that existed during the Pliocene, having persisted until just over 2.58 million years ago. Although not the oldest fossil species of the genus Leptoptilos it was the first fossil species of the genus to be described. Furthermore, it was the largest known species of stork ever and amongst the tallest and heaviest flying birds known to have existed, having reached at least 2 m in height.

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References

  1. Lesson, René (1831). Traité d'Ornithologie, ou Tableau Méthodique (in French). Vol. 1. Paris: F.G. Levrault. p. 583 (Livraison 8). Published in 8 livraisons between 1830 and 1831. For the publication date see: Dickinson, E.C.; Overstreet, L.K.; Dowsett, R.J.; Bruce, M.D. (2011). Priority! The Dating of Scientific Names in Ornithology: a Directory to the literature and its reviewers. Northampton, UK: Aves Press. p. 119. ISBN   978-0-9568611-1-5.
  2. Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 222. ISBN   978-1-4081-2501-4.
  3. Gray, George Robert (1840). A List of the Genera of Birds : with an Indication of the Typical Species of Each Genus. London: R. and J.E. Taylor. p. 67.
  4. Mayr, Ernst; Cottrell, G. William, eds. (1979). Check-List of Birds of the World. Vol. 1 (2nd ed.). Cambridge, Massachusetts: Museum of Comparative Zoology. p. 251.
  5. Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (August 2022). "Storks, frigatebirds, boobies, darters, cormorants". IOC World Bird List Version 12.2. International Ornithologists' Union. Retrieved 16 November 2022.
  6. Meijer, Hanneke J. M.; Sutikna, Thomas; Wahyu Saptomo, E.; Tocheri, Matthew W. (2022). "More bones of Leptoptilos robustus from Flores reveal new insights into giant marabou stork paleobiology and biogeography". Royal Society Open Science. 9 (7): 220435. Bibcode:2022RSOS....920435M. doi: 10.1098/rsos.220435 . PMC   9277297 . PMID   35845853. S2CID   250459008.
  7. Meijer HJ, Due RA (2010). "A new species of giant marabou stork (Aves: Ciconiiformes) from the Pleistocene of Liang Bua, Flores (Indonesia)". Zoological Journal of the Linnean Society. 160 (4): 707–724. doi: 10.1111/j.1096-3642.2010.00616.x .