|Head of Indian grey hornbill, woodcut from The Fauna of British India, Including Ceylon and Burma|
Hornbills in the genus Ocyceros are small Asian birds that have curved triangular bills and grey plumage, therefore being called "grey hornbills". They have black and grey eye rings and their eyes are usually dark with black irises like most birds. All of the species have different coloured bills with the Indian grey hornbill having a dark greyish bill, the Sri Lanka grey hornbill having a pale yellowish bill and the Malabar grey hornbill having a more yellowish orange bill.
The genus contains three species:
- Malabar grey hornbill, Ocyceros griseus
- Sri Lanka grey hornbill, Ocyceros gingalensis
- Indian grey hornbill, Ocyceros birostris
- "ITIS Report: Ocyceros". Integrated Taxonomic Information System. Retrieved 13 September 2015.
- Kinnaird, Margaret F.; O'Brien, Timothy G. (2007). The Ecology and Conservation of Asian Hornbills: Farmers of the Forest. Chicago, IL, US: University of Chicago Press. p. 5. ISBN 978-0-226-43712-5.
- Gill, Frank; Donsker, David, eds. (2019). "Mousebirds, Cuckoo Roller, trogons, hoopoes, hornbills". World Bird List Version 9.2. International Ornithologists' Union. Retrieved 23 July 2019.
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