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Ocyceros
Head of Indian grey hornbill, woodcut from The Fauna of British India, Including Ceylon and Burma
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Bucerotiformes
Family:	Bucerotidae
Genus:	Ocyceros Hume, 1873
Type species
Buceros birostris Scopoli, 1786
Species
O. birostris O. gingalensis O. griseus

Ocyceros is a genus of birds in the family Bucerotidae. Established by Allan Octavian Hume in 1873, it contains several species that are limited to the Indian subcontinent.

Description

Hornbills in the genus Ocyceros are small Asian birds with curved triangular bills and grey plumage. As such, they are often called "grey hornbills". They have black and grey eye rings and their eyes are usually dark with black irises. All of the species have different coloured bills: the Indian grey hornbill has a dark greyish bill, the Sri Lanka grey hornbill has a pale yellowish bill, and the Malabar grey hornbill has a more yellowish orange bill.

Species

The genus contains three species:

Image	Scientific name	Common name	Distribution
	Ocyceros griseus	Malabar grey hornbill	Western Ghats and associated hills of southern India
	Ocyceros gingalensis	Sri Lanka grey hornbill	Sri Lanka
	Ocyceros birostris	Indian grey hornbill	India

References

1. "Bucerotidae". aviansystematics.org. The Trust for Avian Systematics. Retrieved 2023-07-26.
2. ^ "ITIS Report: Ocyceros". Integrated Taxonomic Information System. Retrieved 13 September 2015.
3. ^ 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.
4. 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.

v t e Genera of trogons, hornbills, kingfishers, woodpeckers and their extinct allies
Kingdom: Animalia Phylum: Chordata Class: Aves Infraclass: Neognathae Clade: Coraciimorphae Clade: Cavitaves
Cavitaves Leptosomiformes Leptosomidae Leptosomus †Plesiocathartes? †Waltonavis Eucavitaves Trogoniformes Trogonidae Apalharpactes Apaloderma †Eotrogon Euptilotis †Foshanornis Harpactes †Masillatrogon †Paratrogon Pharomachrus †Primotrogon Priotelus †Septentrogon Trogon Picocoraciae Bucerotiformes See below ↓ Picodynastornithes Coraciiformes See below ↓ Piciformes See below ↓
Bucerotiformes Bucerotiformes †Laurillardiidae Laurillardia †Messelirrisoridae Messelirrisor Upupi Phoeniculidae †Phirriculus Phoeniculus Rhinopomastus Upupidae Upupa Buceroti Bucorvidae Bucorvus †Euroceros Bucerotidae Aceros Anorrhinus Anthracoceros Berenicornis Buceros Bycanistes Ceratogymna Horizocerus Lophoceros Ocyceros Penelopides Rhabdotorrhinus Rhinoplax Rhyticeros Tockus
Coraciiformes incertae sedis †Cryptornis †Paracoracias †Quasisyndactylus †Eocoraciidae Eocoracias †Geranopteridae Geranopterus †Primobucconidae Primobucco Septencoracias Brachypteraciidae Atelornis Brachypteracias Geobiastes Uratelornis Coraciidae †Chehuenia Coracias Eurystomus †Miocoracias Meropidae Meropogon Merops Nyctyornis Alcedines Alcedinidae Alcedininae Alcedo Ceyx Corythornis Ispidina Cerylinae Ceryle Chloroceryle Megaceryle Halcyoninae Actenoides Caridonax Cittura Clytoceyx Dacelo Halcyon Lacedo Melidora Pelargopsis Syma Tanysiptera Todiramphus Momotidae Aspatha Baryphthengus Electron Eumomota Hylomanes Momotus †Protornis? Todidae †Palaeotodus Todus
Piciformes incertae sedis †"Homalopus" †Pristineanis †Gracilitarsidae Gracilitarsus Neanis †Sylphornithidae Oligosylphe Palaegithalus? Sylphornis Galbuli †Jacamatia Bucconidae Bucco Chelidoptera Hapaloptila Hypnelus Malacoptila Micromonacha Monasa Nonnula Notharchus Nystalus Galbulidae Brachygalba Galbalcyrhynchus Galbula Jacamaralcyon Jacamerops Pici incertae sedis †Rupelramphastoides †Miopiconidae Miopico †Picavidae Picavus Ramphastides Capitonidae Capito †Capitonides Eubucco Lybiidae Buccanodon Cryptolybia Gymnobucco Lybius Pogoniulus Pogonornis Stactolaema Trachyphonus Tricholaema Megalaimidae Caloramphus Psilopogon Ramphastidae Andigena Aulacorhynchus Pteroglossus Ramphastos Selenidera Semnornithidae Semnornis Picides Indicatoridae Indicator Melichneutes Melignomon Prodotiscus Picidae See below ↓
Picidae incertae sedis †Bitumenpicus †Breacopus †Palaeonerpes †Palaeopicus †Piculoides Jynginae Jynx Picumninae Picumnus Sasiinae Sasia Verreauxia Picinae †Australopicus †Palaeonerpes †Pliopicus Nesoctitini Nesoctites Hemicircini Hemicircus Picini Campethera Celeus Chrysophlegma Colaptes Dinopium Dryocopus Gecinulus Geocolaptes Micropternus Meiglyptes Mulleripicus Pardipicus Piculus Picus Campephilini Blythipicus Campephilus Chrysocolaptes Reinwardtipicus Melanerpini Chloropicus Dendrocopos Dendrocoptes Dendropicos Dryobates Leiopicus Leuconotopicus Melanerpes Picoides Sphyrapicus Veniliornis Xiphidiopicus Yungipicus

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