Indian Grey Hornbill Ocyceros birostris


Balasubramanian, P.; Santhoshkumar, E.; Anbarasu, C. 2011. Vegetation features and restoration initiatives in the Indian grey hornbill habitats in Sathyamangalam Wildlife sanctuary, Eastern Ghats, India. Raffles Bulletin of Zoology 24: 53-57.

Balasubramanian, P.; Vijayan, V. S.; Prasad, S. N.; Venkitachalam, R. 2005. Status and distribution of the hornbills in the Eastern Ghats. Project Repor. 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.

Charde, P.; Kasambe, R.; Tarar, J. 2011. Breeding behavior of Indian grey hornbill in central India. The Raffles Bulletin of Zoology 24: 59-64.

Datta, A.; Naniwadekar, R.; Rao, M.; Sreenivasan, R.; Hiresavi, V. 2018. Hornbill Watch: A citizen science initiative for Indian hornbills. Indian Birds 14 (3): 65-70.

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

Gadikar, A. 2017. Adaptations of the Indian Grey Hornbill Ocyceros birostris in an urban environment. Indian BIRDS 13: 167-168.

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

Kinnaird, M. F.; O'Brien, T. G. 2008. Breeding ecology of the Sulawesi Red-knobbed Hornbill, Aceros cassidix. Ibis 141(1): 60-69.

Poonswad, P., Kemp, A.C. & Strange, M. 2013. Hornbills of the World: A Photographic Guide. Draco Publishing and Hornbill Research Foundation.

Santhoshkumar, E.; Balasubramanian, P. 2010. Breeding behaviour and nest tree use by Indian Grey Hornbill Ocyceros birostris in the Eastern Ghats, India. Forktail 26: 82-85.

Santhoshkumar, E.; Balasubramanian, P. 2011. Seed dispersal by Indian Grey Hornbill Ocyceros birostris in Eastern Ghats, India. Ecotropica 17: 71-77.

Santhoshkumar, E.; Balasubramanian, P. 2014. Food habits of Indian Grey Hornbill in Sathyamangalam Forest Division, Eastern Ghats. Journal of Bombay Natural History Society 111(2): 90-97.

Further resources

IUCN SSC Hornbill Specialist Group

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Media resources

Recommended citation
BirdLife International (2022) Species factsheet: Ocyceros birostris. Downloaded from on 04/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from on 04/12/2022.