• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2020	Least Concern
2016	Least Concern
2012	Least Concern
2009	Least Concern
2008	Least Concern
2004	Least Concern
2000	Lower Risk/Least Concern
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	3,020,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	stable	-	suspected	-
Generation length	5.8 years	-	-	-

Population justification: The global population size has not been quantified, but the species is reported to be widespread and often common (del Hoyo et al. 2001).

Trend justification: The population is suspected to be stable in the absence of evidence for any declines or substantial threats.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Bangladesh	extant	vagrant
India	extant	native	yes
Nepal	extant	native	yes
Pakistan	extant	native	yes

Country/Territory	IBA Name
India	Achanakmar Wildlife Sanctuary and Maniyari Reservoir
India	Bondla Wildlife Sanctuary
India	Dalma Wildlife Sanctuary
India	Guru Ghasidas Tiger Reserve
India	Hazaribagh Wildlife Sanctuary
India	Karnala Bird Sanctuary
India	Mahendri Reserve Forest
India	Noorukuppalakonda Reserve Forest
India	North Karanpura Valley
India	Pachmarhi Biosphere Reserve
India	Pench Tiger Reserve
India	Simbalbara National Park
India	Tilaiya Dam
India	Topchanchi Wildlife Sanctuary
Nepal	Barandabhar forests and wetlands
Nepal	Bardia National Park
Nepal	Chitwan National Park
Nepal	Dharan forests
Nepal	Farmlands in Lumbini area
Nepal	Koshi Tappu Wildlife Reserve and Koshi Barrage
Nepal	Parsa Wildlife Reserve
Nepal	Sukla Phanta Wildlife Reserve

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Arable Land	suitable	resident
Artificial/Terrestrial	Rural Gardens	suitable	resident
Forest	Subtropical/Tropical Dry	major	resident
Savanna	Dry	major	resident
Altitude	0 - 1500 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Biological resource use	Gathering terrestrial plants - Unintentional effects (species is not the target)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Species mortality

Purpose	Scale
Food - human	subsistence, national
Medicine - human & veterinary	subsistence, national
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Indian Grey Hornbill Ocyceros birostris. Downloaded from https://datazone.birdlife.org/species/factsheet/indian-grey-hornbill-ocyceros-birostris on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.