This large hornbill qualifies as Vulnerable because it has a small, rapidly declining population as a result of destruction of evergreen forest and hunting (BirdLife International 2001).
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
117 cm. Large hornbill with distinctive rufous head and underparts. Males are black above with white-tipped outer primaries, white tail with black basal half, pale yellowish bill with row of vertical dark ridges on upper mandible and almost no casque, blue orbital skin and red gular skin. Female has black head, neck and underparts and slightly duller orbital skin. Juvenile is like male but bill smaller without dark ridges, tail feathers may be narrowly dark-tipped. Voice Loud barking kup or kok notes.
BirdLife International. 2001. Threatened birds of Asia: the BirdLife International Red Data Book. BirdLife International, Cambridge, U.K.
Choudhury, A. 2003. Birds of Eaglenest Wildlife Sanctuary and Sessa Orchid Sanctuary, Arunachal Pradesh, India. Forktail 19: 1-13.
Datta, A. 2009. Observations on Rufous-necked Aceros nipalensis and Austen's Brown Anorrhinus austeni Hornbills in Arunachal Pradesh: natural history, conservation status and threats. Indian Birds 5(4): 108-117.
Kinnaird, M. F.; O'Brien, T. G. 2007. The ecology and conservation of Asian Hornbills: farmers of the forest. University of Chicago Press, Chicago, IL, USA.
Further web sources of information
Detailed species accounts from the Threatened birds of Asia: the BirdLife International Red Data Book (BirdLife International 2001).
Text account compilers
Benstead, P., Bird, J., Davidson, P., Derhé, M., Mahood, S., Peet, N., Tobias, J.
Bishop, K., Eames, J.C., Ghose, D., Praveen, J.
IUCN Red List evaluators
Butchart, S., Symes, A.
BirdLife International (2015) Species factsheet: Aceros nipalensis. Downloaded from http://www.birdlife.org on 25/01/2015. Recommended citation for factsheets for more than one species: BirdLife International (2015) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/01/2015.
This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.
To provide new information to update this factsheet or to correct any errors, please email BirdLife
To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.
Additional resources for this species
|Current IUCN Red List category||Vulnerable|
|Species name author||(Hodgson, 1829)|
|Population size||1500-7000 mature individuals|
|Distribution size (breeding/resident)||285,000 km2|
|Links to further information|
|- Additional Information on this species|