Great hornbill

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Great hornbill
Great hornbill Photograph by Shantanu Kuveskar.jpg
Male
Female Great Hornbill by Shantanu Kuveskar.jpg
Female
Both in Raigad, Maharashtra
CITES Appendix I (CITES) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Bucerotiformes
Family: Bucerotidae
Genus: Buceros
Species:
B. bicornis
Binomial name
Buceros bicornis
BucerosBicornisMap.svg
Synonyms

Buceros homrai [2]
Dichoceros bicornis
Buceros cavatus
Homraius bicornis
Dichoceros cavatus
Buceros cristatus

Contents

The great hornbill (Buceros bicornis), also known as the concave-casqued hornbill, great Indian hornbill or great pied hornbill, is one of the larger members of the hornbill family. It occurs in the Indian subcontinent and Southeast Asia. It is predominantly frugivorous, but also preys on small mammals, reptiles and birds. It has been listed as Vulnerable on the IUCN Red List since 2018. It is known to have lived for nearly 50 years in captivity. Due to its large size and colour, and importance in many tribal cultures and rituals, the Government of Kerala declared it as the official Kerala state bird.

Taxonomy

The great hornbill was formally described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae . He placed it with the rhinoceros hornbill in the genus Buceros and coined the binomial name Buceros bicornis. Linnaeus specified the location as China. [3] The genus name is from Latin becerus meaning "horned like an ox" which in turn is from the Ancient Greek boukerōs which combines bous meaning "ox" with kerōs meaning "horn". The specific bicornis is Latin and means "two-horned". [4] The species is monotypic: no subspecies are recognised. [5]

The species was formerly broken into subspecies cavatus, from the Western Ghats, and homrai, the nominate form from the sub-Himalayan forests. The subspecies from Sumatra was sometimes called cristatus. [6] Variation across populations is mainly in size, Himalayan birds being larger than those from further south, and the species is now usually considered monotypic. [7] [8]

Description

The iris, underside of the casque and orbital skin colours vary between the sexes Bucerosbicornis.svg
The iris, underside of the casque and orbital skin colours vary between the sexes
Illustration by English zoological artist T. W. Wood showing the eyelashes, worn bill edge and the concave casque with ridged sides Malay Archipelago Hornbill.jpg
Illustration by English zoological artist T. W. Wood showing the eyelashes, worn bill edge and the concave casque with ridged sides

The great hornbill is a large bird, 95–130 cm (37–51 in) long, with a 152 cm (60 in) wingspan and a weight of 2 to 4 kg (4.4 to 8.8 lb). The average weight of 7 males is 3 kg (6.6 lb) whereas that of 3 females is 2.59 kg (5.7 lb). [9] It is the heaviest, but not the longest, Asian hornbill. [9] [10] With the separation of the ground hornbills into a separate family, Bucorvidae, the great hornbill reigns as the heaviest of all typical hornbills. [9] [11] Females are smaller than males and have bluish-white instead of red eyes, although the orbital skin is pinkish. Like other hornbills, they have prominent "eyelashes".[ citation needed ]

The most prominent feature of the hornbill is the bright yellow and black casque on top of its massive bill. The casque appears U-shaped when viewed from the front, and the top is concave, with two ridges along the sides that form points in the front, whence the Latin species epithet bicornis (two-horned). The back of the casque is reddish in females, while the underside of the front and back of the casque is black in males.[ citation needed ]

The casque is hollow and serves no known purpose, although it is thought to be the result of sexual selection. Male hornbills indulge in aerial casque butting, with birds striking each other in flight. [12] The male spreads the preen gland secretion, which is yellow, onto the primary feathers and bill to give them the bright yellow colour. [13] The commissure of the beak is black and has a serrated edge which becomes worn with age.[ citation needed ]

The wing beats are heavy, and the sound produced by birds in flight can be heard from a distance. This sound has been likened to the puffing of a steam locomotive starting up. The flight involves stiff flaps followed by glides with the fingers splayed and upcurled. [14] [15]

Like other members of the hornbill family, they have highly pneumatized bones, with hollow air cavities extending to the tips of the wing bones. This anatomical feature was noted by Richard Owen, who dissected a specimen that died at the Zoological Society of London in 1833. [16]

Distribution and habitat

The great hornbill is native to the forests of India, Bhutan, Nepal, mainland Southeast Asia and Sumatra. [17] Its distribution is fragmented in the Western Ghats and in the foothills of the Himalayas. Deforestation has reduced its range in many parts of India such as in the Kolli hills where it was recorded in the 1860s. [18]

It prefers dense old growth unlogged forests in hilly regions. [19] [20] It appears to be dependent on large stretches of rain forests. [21]

In Thailand, the home range of males was found to be about 3.7 km (2.3 mi) during the breeding season and about 14.7 km (9.1 mi) during the non-breeding season. [22] Molecular approaches to the study of its population diversity have been attempted. [23]

Behaviour and ecology

Food and feeding

Great hornbills are usually seen in small parties, with larger groups sometimes aggregating at fruit trees. A congregation of 150 to 200 birds has been recorded in southeastern Bhutan. [14] In the wild, the great hornbill's diet consists mainly of fruit. Figs are particularly important as a food source. [24] Vitex altissima has been noted as another important food source. Great hornbills also forage on lipid-rich fruits of the families Lauraceae and Myristicaceae such as Persea , Alseodaphne and Myristica . [25] They obtain water entirely from their diet of fruits. They are important dispersers of many forest tree species. [26] They will also eat small mammals, birds, [27] small reptiles and insects. [28] Lion-tailed macaques have been seen to forage alongside these hornbills. [29]

They forage along branches, moving along by hopping, looking for insects, nestling birds and small lizards, tearing up bark and examining them. Prey are caught, tossed in the air and swallowed. A rare squirrel, the Travancore flying squirrel (Petinomys fuscocapillus) has been eaten, and Indian scops owl (Otus bakkamoena), jungle owlet (Glaucidium radiatum) and Sri Lanka green pigeon (Treron pompadora) have been taken as prey in the Western Ghats. [30]

Breeding

Male feeding the female at the nest Hornbill nest.jpg
Male feeding the female at the nest

During the breeding season (January to April [7] ) great hornbills become very vocal. They make loud duets, beginning with a loud "kok" given about once a second by the male, to which the female joins in. The pair then calls in unison, turning into a rapid mixture of roars and barks. [30] They prefer mature forests for nesting. Large, tall and old trees, particularly emergents that rise above the canopy, seem to be preferred for nesting. [31] [32] They form monogamous pair bonds and live in small groups of 2-40 individuals. Group courtship displays involving up to 20 birds have been observed. [33]

The female hornbill builds a nest in the hollow of a large tree trunk, sealing the opening with a plaster made up mainly of feces. [6] [34] [35] She remains imprisoned there, relying on the male to bring her food, until the chicks are half developed. During this period the female undergoes a complete moult. The young chicks have no feathers and appear very plump. The mother is fed by her mate through a slit in the seal. The clutch consists of one or two eggs, which she incubates for 38–40 days. The female voids feces through the nest slit, as do the chicks from the age of two weeks. [30] Once the female emerges from the nest, the chicks seal it again. [7]

The young birds have no trace of a casque. After the second year the front extremity separates from the culmen, and in the third year it becomes a transverse crescent with the two edges growing outwards and upwards, while the anterior widens to the width of the rear end. Full development takes five years. [36]

Roosting

Roost sites are used regularly and birds arrive punctually at sunset from long distances, following the same routes each day. Several tall trees in the vicinity may be used, the birds choosing the highest branches with little foliage. They jockey for position until late at dusk. When sleeping they draw their neck back and the bill is held upwards at an angle. [14]

Threats

The great hornbill is threatened mainly by habitat loss due to deforestation. It is hunted for its meat, fat and body parts like casque and tail feathers, which are used as adornments. [1] Tribal peoples hunt the great Indian hornbill for its various parts. The beaks and head are used in charms and the flesh is believed to be medicinal. Young birds are considered a delicacy. [14] Declines in population have been noted in many areas such as Cambodia. [37]

Tribesmen in parts of northeastern India use the feathers for head-dresses, and the skulls are often worn as decorations. [38] [39] The Sema Nagas consider the flesh unfit for eating, believing that it produces sores on their feet, as in the bird. When dancing with the feathers of the hornbill, they avoid eating vegetables, as doing so is also believed to produce the same sores on the feet. [40]

Conservation

The great hornbill is listed in CITES Appendix I. It has been listed as Vulnerable on the IUCN Red List since 2018. [1] Conservation programmes have attempted to provide tribes with feathers from captive hornbills and ceramic casques to substitute for natural ones. [41]

In captivity

Very few hornbills are held in captivity, and few of them breed well. Females at the nests are extremely easy to capture, and birds caught in the wild are mostly female. Breeding them in captivity has been notoriously difficult, with fewer than a dozen successful attempts. Their extreme selectivity for mates and their long and strong pair bonds make them difficult to maintain for breeding. [42] [43] [44] [45]

Captive great hornbills eat fruits and meat, a healthy diet consisting mostly of fruit and some source of protein. A few have been tamed in captivity but their behaviour in captivity is described as highly strung. Captive specimens bask in the sun with outstretched wings. [46]

In culture

The great hornbill is called homrai in Nepal and banrao in Mussoorie, both meaning "King of the Jungle". [47] It is the official state bird of the Indian states of Kerala and Arunachal Pradesh. [48]

Use as a symbol

William, a captive great hornbill Buceros bicornis -illustration in book.jpg
William, a captive great hornbill

A great hornbill named William was the model for the logo of the Bombay Natural History Society and the name of the society's building. Norman Kinnear described William as follows in the obituary of Walter Samuel Millard: [49]

Every visitor to the Society's room in Apollo Street will remember the Great Indian Hornbill, better known as the "office canary" which lived in a cage behind Millard's chair in Phipson & Co.'s office for 26 years and died in 1920. It is said its death was caused by swallowing a piece of wire, but in the past "William" had swallowed a lighted cigar without ill effects and I for my part think that the loss of his old friend was the principal cause. [50] [51]

Related Research Articles

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Hornbills are birds found in tropical and subtropical Africa, Asia and Melanesia of the family Bucerotidae. They are characterized by a long, down-curved bill which is frequently brightly coloured and sometimes has a horny casque on the upper mandible. Hornbills have a two-lobed kidney. They are the only birds in which the first and second neck vertebrae are fused together; this probably provides a more stable platform for carrying the bill. The family is omnivorous, feeding on fruit and small animals. They are monogamous breeders nesting in natural cavities in trees and sometimes cliffs. A number of mainly insular species of hornbill with small ranges are threatened with extinction, mainly in Southeast Asia.

<span class="mw-page-title-main">Sri Lanka frogmouth</span> Species of bird

The Sri Lanka frogmouth, Sri Lankan frogmouth or Ceylon frogmouth is a small frogmouth found in the Western Ghats of south India and Sri Lanka. Related to the nightjars, it is nocturnal and is found in forest habitats. The plumage coloration resembles that of dried leaves and the bird roosts quietly on branches, making it difficult to see. Each has a favourite roost that it uses regularly unless disturbed. It has a distinctive call that is usually heard at dawn and dusk. The sexes differ slightly in plumage.

<span class="mw-page-title-main">Yellow-casqued hornbill</span> Species of bird

The yellow-casqued hornbill, also known as the yellow-casqued wattled hornbill, is found in the rainforest of coastal regions of West Africa, for example in Côte d'Ivoire. It is threatened by habitat loss.

<span class="mw-page-title-main">African grey hornbill</span> Species of bird

The African grey hornbill is a member of the hornbill family of mainly tropical near-passerine birds found in the Old World. It is a widespread resident breeder in much of sub-Saharan Africa and the southwest of the Arabian Peninsula. The African grey hornbill has escaped or been deliberately released into Florida, USA, but there is no evidence that the population is breeding and may only persist due to continuing releases or escapes.

<span class="mw-page-title-main">Malabar grey hornbill</span> Species of bird

The Malabar gray hornbill is a hornbill endemic to the Western Ghats and associated hills of southern India. They have a large beak but lack the casque that is prominent in some other hornbill species. They are found mainly in dense forest and around rubber, arecanut or coffee plantations. They move around in pairs or small groups, feeding on figs and other forest fruits. Their loud cackling and laughing call makes them familiar to people living in the region.

<span class="mw-page-title-main">Malabar pied hornbill</span> Species of bird

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<span class="mw-page-title-main">Walden's hornbill</span> Species of bird

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<span class="mw-page-title-main">Wreathed hornbill</span> Species of bird

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<span class="mw-page-title-main">Yellow-throated bulbul</span> Species of songbird

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<span class="mw-page-title-main">Bucerotiformes</span> Order of birds

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<span class="mw-page-title-main">Rufous hornbill</span> Species of bird

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<span class="mw-page-title-main">Narcondam hornbill</span> Species of bird

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<span class="mw-page-title-main">Oriental pied hornbill</span> Species of bird

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<span class="mw-page-title-main">Sulu hornbill</span> Species of bird

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<span class="mw-page-title-main">Casque (anatomy)</span> Anatomical feature in birds

A casque is an anatomical feature found in some species of birds, reptiles, and amphibians. In birds, it is an enlargement of the bones of the upper mandible or the skull, either on the front of the face, or the top of the head, or both. The casque has been hypothesized to serve as a visual cue to a bird's sex, state of maturity, or social status; as reinforcement to the beak's structure; or as a resonance chamber, enhancing calls. In addition, they may be used in combat with other members of the same species, in the gathering of food, or in thermoregulation.

References

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  40. ↑ Hutton, J.H. (1921). The Sema Nagas. London: Macmillan and Co. p. 92.
  41. ↑ "Artificial beaks save hornbills from extinction in Arunachal - Firstpost". www.firstpost.com. 7 February 2012. Retrieved 3 April 2018.
  42. ↑ Crofoot, M.; Mace, M.; Azua, J.; MacDonald, E.; Czekala, N.M. (2003). "Reproductive assessment of the Great Hornbill (Buceros bicornis) by fecal hormone analysis" (PDF). Zoo Biology. 22 (2): 135–145. CiteSeerX   10.1.1.501.9876 . doi:10.1002/zoo.10083. Archived from the original (PDF) on 27 September 2011. Retrieved 10 April 2010.
  43. ↑ Bohmke, B.W. (1987). "Breeding the great Indian hornbill at the St. Louis Zoological Park, USA". Avicultural Magazine. 93: 159–161.
  44. ↑ de Ruiter, M. (1998). "The great Indian hornbill: a breeding attempt". AFAWatchbird. 25: 34–35.
  45. ↑ Golding, R.R.; Williams, M.G. (1986). "Breeding the great Indian hornbill at the Cotswold Wild Life Park". International Zoo Yearbook. 24/25: 248–252. doi:10.1111/j.1748-1090.1985.tb02548.x.
  46. ↑ Ellison, B.C. (1923). "Notes on the habits of a young Hornbill". Journal of the Bombay Natural History Society. 29 (1): 280–281.
  47. ↑ Bingham, C.T. (1897). "The great Indian hornbill in the wild state". Journal of the Bombay Natural History Society. 11 (2): 308–310.
  48. ↑ "Symbols of States of India". affairscloud.com.
  49. ↑ Spence, R.A. (1920). "The Great Indian Hornbill (Dichocerros bicornis)". Journal of the Bombay Natural History Society. 27 (1): 174.
  50. ↑ Kinnear, N.B. (1952). "Millard, W. S." Journal of the Bombay Natural History Society. 50 (4304): 910–913. Bibcode:1952Natur.169..690K. doi: 10.1038/169690b0 . S2CID   29652369.
  51. ↑ Phipson, H.M. (1897). "The great Indian hornbill in captivity". Journal of the Bombay Natural History Society. 11 (2): 307–308.

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