Malabar Grey Hornbill Ocyceros griseus


Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Near Threatened
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 271,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals unknown not applicable not applicable 0
Population trend Decreasing suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 10.3 - - -

Population justification: The global population size has not been quantified, but the species is reported to be locally common in some small reserves (del Hoyo et al. 2001).

Trend justification: The population is suspected to be in decline locally owing to ongoing habitat destruction (del Hoyo et al. 2001).

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
India N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
India Amarambalam Reserved Forest - Nilambur
India Anshi National Park
India Aralam Wildlife Sanctuary
India Bandipur National Park
India Bhadra Wildlife Sanctuary
India Bhagwan Mahavir Wildlife Sanctuary (including Molem)
India Bhimashankar Wildlife Sanctuary
India Bhimgad Forests
India Brahmagiri Wildlife Sanctuary
India Cotigao Wildlife Sanctuary
India Dandeli Wildlife Sanctuary
India Eravikulam National Park
India Gudavi Bird Sanctuary
India Indira Gandhi Wildlife Sanctuary and National Park
India INS - Shivaji and adjoining areas, Lonavla
India Kalakad-Mundanthurai Tiger Reserve
India Kemmangundi and Bababudan Hills
India Kemphole Reserve Forest
India Koyna Wildlife Sanctuary
India Kudremukh National Park
India Kulahupuzha Reserved Forest
India Longwood Shola - Kothagiri
India Mhadei Wildlife Sanctuary and area
India Nagarhole National Park
India Nelliyampathy (Nemmara Division)
India Neyyar Wildlife Sanctuary
India Peechi - Vazhani Wildlife Sanctuary
India Peppara Wildlife Sanctuary
India Periyar Wildlife Sanctuary
India Pushpagiri Wildlife Sanctuary
India Radhanagari Wildlife Sanctuary
India Sharavathi Valley Wildlife Sanctuary
India Shendurney Wildlife Sanctuary
India Silent Valley National Park
India Someshwara Wildlife Sanctuary
India Srivilliputhur Wildlife Sanctuary
India Talakaveri Wildlife Sanctuary
India Thattekkad Wildlife Sanctuary
India Vazhachal Forest Division
India Wynaad Wildlife Sanctuary

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Plantations suitable resident
Artificial/Terrestrial Rural Gardens suitable resident
Forest Subtropical/Tropical Dry major resident
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane major resident
Altitude 600 - 600 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2019) Species factsheet: Ocyceros griseus. Downloaded from on 21/08/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from on 21/08/2019.