Buceros bicornis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Bucerotiformes Bucerotidae

Scientific Name: Buceros bicornis
Species Authority: Linnaeus, 1758
Common Name(s):
English Great Hornbill
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Bishop, K.
Facilitator/Compiler(s): Benstead, P., Gilroy, J., Khwaja, N. & Taylor, J.
Although this species has a large range, it occurs at low densities and is patchily distributed. It may have a moderately small population and is likely to be declining moderately rapidly throughout its range; it is therefore listed as Near Threatened as it almost qualifies for listing as threatened under criteria A2cd+3cd+4cd; C1.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Buceros bicornis has a wide distribution, occurring in China (rare resident in west and south-west Yunnan and south-east Tibet), India (locally fairly common, but declining), Nepal (local and uncommon, largely in protected areas), Bhutan (fairly common), Bangladesh (vagrant), Myanmar (scarce to locally common resident throughout), Thailand (widespread, generally scarce but locally common), Lao PDR (formerly common; currently widespread but scarce and a major decline has clearly occurred), Viet Nam (rare and declining resident), Cambodia (rare), peninsular Malaysia (uncommon to more or less common) and Indonesia: the species is now uncommon on Sumatra where it has shown a significant decline following recent devastation of the island's lowland forest (K. D. Bishop in litt. 2012).

Countries occurrence:
Bhutan; Cambodia; China; India; Indonesia; Lao People's Democratic Republic; Malaysia; Myanmar; Nepal; Thailand; Viet Nam
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:10300000
Continuing decline in extent of occurrence (EOO):YesExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Upper elevation limit (metres):2000
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population has been estimated to number 3,500 individuals in west India. This only constitutes 5-24% of the species's range, so a very preliminary estimate of the total population is 10,000-70,000 individuals. It is probably best placed in the band 20,000-49,999 individuals, roughly equating to 13,000-27,000 mature individuals.

Trend Justification:  A moderately rapid decline is suspected to be occurring, as a result of the degradation and clearance of forests throughout the species's range, as well as persecution by hunters and trappers.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:13000-27000Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:This species frequents wet evergreen and mixed deciduous forests, ranging out into open deciduous areas to visit fruit trees and ascending slopes to at least 1,560 m (Mudappa and Raman 2009). The abundance of this species tends to be correlated with the density of large trees, and it is therefore most common in unlogged forest; indeed, recent work has shown a significant nesting preference for larger trees, usually in old-growth forest (James and Kannan 2009).

Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):18.4
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Logging is likely to have impacted on this species throughout its range, particularly as it shows a preference for forest areas with large trees that may be targeted by loggers. Forest clearance for agriculture is also likely to have contributed to declines. It is particularly susceptible to hunting pressure as it is large and visits predictable feeding sites (such as fruiting trees), and its casques are kept or sold as trophies. It is also probably impacted by the pet trade (Eames 2008).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CITES Appendix I. The species is captively bred in zoos (Jensen 2008). It occurs in protected areas including Anamalai Tiger Reserve in the Western Ghats, India (Mudappa and Raman 2009).

Conservation Actions Proposed
Monitor populations across its range to determine the magnitude of declines and rates of range contraction. Campaign for the protection of remaining extensive tracts of lowland forest throughout its range.  Develop the existing captive breeding population to support future reintroduction and supplementation efforts.

Citation: BirdLife International. 2016. Buceros bicornis. The IUCN Red List of Threatened Species 2016: e.T22682453A92947174. . Downloaded on 30 April 2017.
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