CR
White-headed Vulture Trigonoceps occipitalis



Taxonomy

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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
A2bcd+3bcd A2bcd+3bcd A2bcd+3bcd; C1

Red List history
Year Category Criteria
2016 Critically Endangered A2bcd+3bcd
2015 Critically Endangered A2bcd+3bcd+4bcd
2012 Vulnerable C1+2a(ii)
2008 Vulnerable C2a(ii)
2007 Vulnerable
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 21,100,000 medium
Extent of Occurrence non-breeding (km2) 22,100,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 medium estimated 2015
Population trend Decreasing poor 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) 73-98 - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Largest subpopulations 100 - - -
Generation length (yrs) 15 - - -

Population justification: An old estimate of 7,000-12,500 mature individuals was extrapolated from a number of regional estimates. This equates to 10,500-18,750 individuals in total. However, a new estimate of the global population suggests the population is much smaller, consisting of just 5,500 individuals (Murn et al. 2016). This equates to just 3,685 mature individuals here placed in the band 2,500-9,999 mature individuals.

Trend justification: The species is thought to be declining at an extremely rapid rate. Ogada et al. (2016) estimate a median decline of 96% (range: 73-98%) over three generations (45 years). The species has shown severe declines throughout its West African range (F. Dowsett-Lemaire in litt. 2006, J.M. Thiollay in litt. 2006) and also across southern Africa (Ferguson-Lees et al. 2001).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Angola N Extant Yes
Benin N Extant Yes
Botswana N Extant Yes
Burkina Faso N Extant Yes
Burundi N Extant Yes
Cameroon N Extant Yes
Central African Republic N Extant Yes
Chad N Extant Yes
Congo, The Democratic Republic of the N Extant Yes
Côte d'Ivoire N Extant Yes
Djibouti N Extant Yes
Eritrea N Extant Yes
Ethiopia N Extant Yes
Gabon N Extant Yes
Gambia N Extant Yes
Ghana N Extant Yes
Guinea N Extant Yes
Guinea-Bissau N Extant Yes
Kenya N Extant Yes
Malawi N Extant Yes
Mali N Extant Yes
Mauritania N Extant Yes
Mozambique N Extant Yes
Namibia N Extant Yes
Niger N Extant Yes
Nigeria N Presence Uncertain
Rwanda N Extant Yes
Senegal N Extant Yes
Somalia N Extant Yes
South Africa N Extant Yes
South Sudan N Extant Yes
Sudan N Extant Yes Yes
Swaziland N Presence Uncertain Yes
Tanzania N Extant Yes
Togo N Extant Yes
Uganda N Extant Yes
Zambia N Extant Yes
Zimbabwe N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Burundi Kigwena Forest Nature Reserve
Kenya Ol Ari Nyiro

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Pastureland suitable resident
Grassland Subtropical/Tropical Dry suitable resident
Savanna Dry suitable resident
Shrubland Subtropical/Tropical Dry suitable resident
Altitude 0 - 4000 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Scale Unknown/Unrecorded Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Agriculture & aquaculture Livestock farming & ranching - Small-holder grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Reduced reproductive success, Species mortality
Biological resource use Hunting & trapping terrestrial animals - Persecution/control Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
Biological resource use Hunting & trapping terrestrial animals - Unintentional effects (species is not the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Human intrusions & disturbance Work & other activities Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species disturbance, Reduced reproductive success
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Pollution Agricultural & forestry effluents - Herbicides and pesticides Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Species mortality

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

Recommended citation
BirdLife International (2017) Species factsheet: Trigonoceps occipitalis. Downloaded from http://www.birdlife.org on 16/12/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 16/12/2017.