Malabar Grey Hornbill Ocyceros griseus


Ali, S.; Ripley, S. D. 1983. Handbook of the birds of India and Pakistan together with those of Bangladesh, Nepal, Sikkim, Bhutan and Ceylon, volume 4: frogmouths to pittas. Oxford University Press, London and New York.

Balasubramanian, P. & Maheswaran, B. 2002. Hornbill-tree interactions with special reference to identification and conservation of keystone mutualists in Nilgiri Biosphere Reserve. Project Report. Salim Ali Centre for Ornithology and Natural History, Coimbatore, India.

Balasubramanian, P., Vijayan, V. S., Prasad, S. N. Ravi, R. & Krishnakumar, N. 2004. Status and distribution of the hornbills in the Western Ghats. Project Report. Salim Ali Centre for Ornithology and Natural History, Coimbatore, India.

Bird, J.P., Martin, R., Akçakaya, H.R., Gilroy, J., Burfield, I.J., Garnett, S.G., Symes, A., Taylor, J., Şekercioğlu, Ç.H. and Butchart, S.H.M. 2020. Generation lengths of the world’s birds and their implications for extinction risk. Conservation Biology 34(5): 1252-1261.

del Hoyo, J.; Elliott, A.; Sargatal, J. 2001. Handbook of the Birds of the World, vol. 6: Mousebirds to Hornbills. Lynx Edicions, Barcelona, Spain.

eBird. 2020. eBird: An online database of bird distribution and abundance [web application]. Ithaca, NY, USA Available at:

IUCN. 2020. The IUCN Red List of Threatened Species. Version 2020-3. Available at: (Accessed: 10 December 2020).

Kemp, A.C. & Boesman, P. 2019. Malabar Grey Hornbill (Ocyceros griseus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. Lynx Edicions, Barcelona. Available at: (Accessed: 22 August 2019).

Maheswaran, B. & Balasubramanian, P. 2003. Nest tree utilization by the Malabar Grey Hornbill Ocyceros griseus in the semi-evergreen forest of Mudumalai Wildlife Sanctuary (S India). Acta Ornithologica 38: 33-37.

Maheswaran, B. 2002. Habitat utilization by Malabar grey hornbill at Mudumalai wildlife sanctuary Western Ghats. Phd Thesis. Bharatiar University, Coimbatore.

Mudappa, D. & Rahman, T. R.S. 2009. A conservation status survey of hornbills (Bucerotidae) in the Western Ghats, India. Indian Birds 5(4): 90-102.

Mudappa, D. & Raman, T. R. S. 2020. Malabar Gray Hornbill (Ocyceros griseus), version 2.0. Ithaca, NY, USA. Available at:

Mudappa, D. 1998. Nesting habitat characteristics, breeding biology, and conservation of the Malabar Grey Hornbill in Anamalai, southern Western Ghats, India. Pages 99-109. In: P. Poonswad (ed.), The Asian Hornbills: Ecology and Conservation., pp. 336. Thai Studies in Biodiversity 2.

Mudappa, D. 2000. Breeding biology of the Malabar Grey Hornbill Ocyceros griseus in southern Western Ghats, India. Journal of the Bombay Natural History Society 97: 15-24.

Mudappa, D. 2005. Eight years monitoring of Malabar Grey Hornbill Ocyceros griseus nest cavity use and dynamics in the Anamalai rainforest, India. In: S. Lum and P. Poonswad (eds), The Ecology of Hornbills: Reproduction and Population, pp. 3-10. Pimdee Karnpim Co., Ltd., Bangkok.

Mudappa, D. C. & Kannan, R. 1997. Nest-site characteristics and nesting success of the Malabar Gray Hornbill in the Southern Western Ghats, India. Wilson Bulletin 109: 102-111.

Raman, T. R. S. & Mudappa, D. 2003. Correlates of hornbill distribution and abundance in rainforest fragments in the southern Western Ghats, India. Bird Conservation International 13: 199-212.

Raman, T. R. S. 2006. Effects of habitat structure and adjacent habitats on birds in tropical rainforest fragments and shaded plantations in the Western Ghats, India. Biodiversity and Conservation 15: 1577–1607.

Sidhu, S., Raman, T. R. S., & Goodale, E. 2010. Effects of plantations and home-gardens on tropical forest bird communities and mixed-species bird flocks in the southern Western Ghats. Journal of the Bombay Natural History Society 107: 91–108.

State of India’s Birds. 2020. State of India’s Birds, 2020: Range, trends and conservation status. The SoIB Partnership.

Further resources

IUCN SSC Hornbill Specialist Group

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Recommended citation
BirdLife International (2024) Species factsheet: Ocyceros griseus. Downloaded from on 25/02/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from on 25/02/2024.