VU
Yellow-casqued Hornbill Ceratogymna elata



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. 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
- - A2cd+3cd+4cd

Red List history
Year Category Criteria
2016 Vulnerable A2cd+3cd+4cd
2012 Vulnerable A2cd+3cd+4cd
2008 Near Threatened A2c,d; A3c,d; A4c,d
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Near Threatened
1988 Lower Risk/Least Concern
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 1,880,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 8000-9000 poor estimated 2007
Population trend Decreasing medium 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) 30-49 - - -
Decline (10 years/3 generation past and future) 30-49 - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 15.8 - - -

Population justification: Recent calculations put the species's area of suitable habitat at 35,808 km2, and mean population density at 0.35 birds/km2. This gives an estimated population size of 12,533 individuals (H. Rainey in litt. 2007), here rounded to 12,500 individuals. This roughly equates to 8,000-9,000 mature individuals.

Trend justification: Observations on the prevalence of high hunting pressure and habitat loss, and the apparent disappearance of the species from some areas, strongly suggest that it is experiencing a rapid population decline.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Cameroon N Extant Yes
Côte d'Ivoire N Extant Yes
Ghana N Extant Yes
Guinea N Extant Yes
Guinea-Bissau N Extant Yes
Liberia N Extant Yes
Mali N Extant Yes
Nigeria N Extant Yes
Senegal N Extant Yes
Sierra Leone N Extant Yes
Togo N Possibly Extinct Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Côte d'Ivoire Comoe National Park
Côte d'Ivoire Sangbe Mountain National Park
Côte d'Ivoire Mount Nimba Strict Nature Reserve
Côte d'Ivoire Gueoule and Glo Mountain Forest Reserves
Côte d'Ivoire Peko Mountain National Park
Côte d'Ivoire Marahoue National Park
Côte d'Ivoire Bossematie Forest Reserve
Côte d'Ivoire Parc National de Taï et Réserve de faune du N'Zo
Côte d'Ivoire Mopri Forest Reserve
Côte d'Ivoire Azagny National Park
Cameroon Banyang Mbo Wildlife Sanctuary
Cameroon Korup National Park
Cameroon Bakossi mountains
Cameroon Mont Nlonako
Cameroon Mount Rata and Rumpi Hills Forest Reserve
Cameroon Yabassi
Cameroon Mount Cameroon and Mokoko-Onge
Ghana Ankasa Resource Reserve - Nini-Sushien National Park
Ghana Bia National Park and Resource Reserve
Ghana Cape Three Points Forest Reserve
Ghana Draw River Forest Reserve
Ghana Ebi River Shelterbelt Forest Reserve
Ghana Fure River Forest Reserve
Ghana Kakum National Park - Assin Attandaso Resource Reserve
Ghana Pra-Sushien Forest Reserve
Ghana Subri River Forest Reserve
Guinea Kounounkan
Guinea Massif du Ziama
Guinea Diécké
Guinea-Bissau Lagoas de Cufada
Guinea-Bissau Rio Tombali, Rio Cumbijã and Ilha de Melo
Guinea-Bissau Cantanhez forests
Liberia Wologizi mountains
Liberia Wonegizi mountains
Liberia Lofa-Gola-Mano Complex
Liberia Nimba mountains
Liberia Zwedru
Liberia Cestos - Senkwen
Liberia Sapo
Liberia Grebo
Nigeria Afi River Forest Reserve
Nigeria Okomu National Park
Nigeria Cross River National Park (Oban Division)
Nigeria Omo Forest Reserve
Nigeria Pandam Wildlife Park
Sierra Leone Outamba-Kilimi National Park
Sierra Leone Loma Mountains Non-hunting Forest Reserve
Sierra Leone Tingi Hills Non-hunting Forest Reserve
Sierra Leone Kangari Hills Non-hunting Forest Reserve
Sierra Leone Western Area Peninsula Forest National Park
Sierra Leone Kambui Hills Forest Reserve
Sierra Leone Gola Forests
Senegal Parc National de Basse Casamance
Togo Fazao-Malfakassa National Park

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Plantations suitable resident
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 1000 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Shifting agriculture Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Majority (50-90%) Slow, Significant Declines Low Impact: 4
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2020) Species factsheet: Ceratogymna elata. Downloaded from http://www.birdlife.org on 13/08/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 13/08/2020.