Slender-billed Vulture Gyps tenuirostris


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.
Rasmussen, P. C.; Parry, S. J. 2001. The taxonomic status of the Long-billed Vulture Gyps indicus. Vulture News 44: 18-21.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
A2ce+4ce A2ce+4ce A2ce+4ce

Red List history
Year Category Criteria
2016 Critically Endangered A2ce+4ce
2015 Critically Endangered A2ce+4ce
2013 Critically Endangered A2ce+4ce
2012 Critically Endangered A2ce+4ce
2010 Critically Endangered A2c,e; A4c,e
2009 Critically Endangered A2c,e; A4c,e
2008 Critically Endangered
2004 Critically Endangered
2002 Critically Endangered
2000 Not Recognised
1994 Not Recognised
1988 Not Recognised
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 2,330,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 1000-2499 poor estimated 2007
Population trend Decreasing medium estimated -
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) 95 - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 16 - - -

Population justification: Considerable confusion over the taxonomy and identification of Gyps vultures has occurred, making it difficult to be sure of the population size. It is considered likely to number 1,000-2,499 mature individuals, equating to 1,500-3,750 individuals in total.

Trend justification: This species declined across South-East Asia during the 20th century probably as a result of the collapse of wild ungulate populations and, to some degree, persecution. Since the mid-1990s, declines have been noted in three species of Gyps vulture across the Indian Subcontinent, including this species. These declines are driven by high adult mortality as a result of residues of the anti-inflammatory drug diclofenac used to treat domestic livestock. An extremely rapid decline is estimated to have occurred over the last three generations.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Bangladesh N Extant Yes
Cambodia N Extant Yes
India N Extant Yes
Laos N Extant Yes
Malaysia N Extinct Yes
Myanmar N Extant Yes
Nepal N Extant Yes
Thailand N Extinct Yes
Vietnam N Possibly Extinct Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Cambodia Chhep
Cambodia Lomphat
Cambodia Mondulkiri - Kratie Lowlands
Cambodia Upper Srepok Catchment
Cambodia Western Siem Pang
India Amchang Hills
India Asan Barrage
India Bherjan-Borajan-Podumoni Wildlife Sanctuary
India Bordoloni - Sampora
India Buxa Tiger Reserve (National Park)
India Chakrashila Complex
India Corbett Tiger Reserve
India Deepor Beel Bird Sanctuary
India Dhansiri Reserve Forest
India Dibang Reserve Forest and adjacent areas
India Dibru - Saikhowa Complex
India Dudhwa National Park
India Dum Duma, Dangori and Kumsong Reserve Forests
India East and North Karbi Anglong Wildlife Sanctuaries
India Fambong Lho Wildlife Sanctuary - Himalayan Zoological Park - Ratey Chu Reserve Forest
India Gibbon (Hollongapar) Sanctuary
India Gobind Sagar and Naina Devi Wildlife Sanctuaries
India Harike Lake Bird Sanctuary
India Innerline, Katakal and Barak Reserve Forests
India Jamjing and Sengajan
India Jhanjimukh - Kokilamukh
India Kalesar Wildlife Sanctuary
India Kaziranga National Park
India Kuarbari Dalani
India Laokhowa and Burhachapori Sanctuaries
India Lowland forests of South Sikkim (Melli-Baguwa-Kitam, Jorethang-Namchi, Sombarey)
India Lumding - Marat Longri
India Mahananda Wildlife Sanctuary
India Majuli
India Manas National Park
India Nameri National Park
India Nokrek National Park
India Nongkhyllem and adjacent areas
India Orang National Park
India Pabho Reserve Forest
India Pabitora Wildlife Sanctuary
India Pani-Dihing Bird Sanctuary
India Pong Dam Lake Wildlife Sanctuary
India Rajaji National Park
India Ramnagar Wildlife Sanctuary
India Ripu and Chirang Reserve Forests
India Sarah Valley, Lower Dharamshala
India Sibsagar Tanks
India Son Beel
India Sonai-Rupai Wildlife Sanctuary
India Sonanadi Wildlife Sanctuary
India Subansiri
India Tamaranga - Dalani - Bhairab Complex
India The Chapories of Lohit Reserve
India Tirap - Burhidihing
India Upper Dihing (East) Complex
India Upper Dihing (West) Complex
India Urpod Beel
Laos Siphandon
Laos Xe Khampho / Xe Pian
Laos Xe Kong Plains
Myanmar Kamaing
Myanmar Nam San Valley
Nepal Annapurna Conservation Area
Nepal Barandabhar forests and wetlands
Nepal Bardia National Park
Nepal Chitwan National Park
Nepal Dang Deukhuri foothill forests and west Rapti wetlands
Nepal Dharan forests
Nepal Farmlands in Lumbini area
Nepal Ghodaghodi Lake
Nepal Jagdishpur Reservoir
Nepal Koshi Tappu Wildlife Reserve and Koshi Barrage
Nepal Mai Valley forests
Nepal Nawalparasi forests
Nepal Parsa Wildlife Reserve
Nepal Rampur valley
Nepal Sukla Phanta Wildlife Reserve

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Urban Areas suitable resident
Forest Subtropical/Tropical Dry suitable resident
Grassland Subtropical/Tropical Dry suitable resident
Savanna Dry suitable resident
Shrubland Subtropical/Tropical Dry suitable resident
Altitude 0 - 2000 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Hunting & trapping terrestrial animals - Persecution/control Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Species mortality
Biological resource use Hunting & trapping terrestrial animals - Unintentional effects (species is not the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Ecosystem degradation, Reduced reproductive success
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Ecosystem degradation, Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Species mortality
Natural system modifications Other ecosystem modifications Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Ecosystem degradation
Pollution Agricultural & forestry effluents - Type Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Majority (50-90%) Very Rapid Declines High Impact: 8
Species mortality

Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - International Non-trivial Recent

Recommended citation
BirdLife International (2019) Species factsheet: Gyps tenuirostris. Downloaded from on 22/05/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from on 22/05/2019.