LC
Eastern Little Hornbill Horizocerus granti



Taxonomy

Taxonomic note

Horizocerus hartlaubi and H. granti (del Hoyo and Collar 2014) were previously placed in the genus Tockus and lumped as T. hartlaubi following Sibley and Monroe (1990, 1993).

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
2014 Least Concern
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 2,010,000 medium
Number of locations -
Severely Fragmented -
Population and trend
Value 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 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 9.8 - - -

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

Trend justification: Although it has been claimed to be restricted to pristine forest (del Hoyo et al. 2001), closely related H. hartlaubi is reportedly more common in open-canopy, logged forest than in mature, closed-canopy forest (F. Dowsett-Lemaire in litt. 2013) and is not thought to be threatened by hunting (H. Rainey in litt. 2013). Nevertheless, it is suspected to be undergoing some declines overall owing to ongoing habitat destruction and fragmentation.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Angola N Extant Yes
Central African Republic N Extant Yes
Congo N Extant Yes
Congo, The Democratic Republic of the N Extant Yes
South Sudan N Extant Yes
Uganda N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Central African Republic Dzanga-Ndoki National Park
Congo Nouabalé-Ndoki National Park complex
Congo Odzala National Park complex
Cameroon Mbam Djerem National Park
Cameroon Banyang Mbo Wildlife Sanctuary
Cameroon Korup National Park
Cameroon Bakossi mountains
Cameroon Yabassi
Cameroon Mbam Minkom - Kala
Cameroon Dja Faunal Reserve
Cameroon Boumba - Bek
Cameroon Campo Ma'an complex
Cameroon Nki
Cameroon Lobéké National Park
Gabon Gamba Protected Areas Complex
Gabon Lopé Faunal Reserve
Gabon Minkébé Forest Reserve
Ghana Ankasa Resource Reserve - Nini-Sushien National Park
Ghana Atewa Range Forest Reserve
Ghana Bia National Park and Resource Reserve
Ghana Boin Tano Forest Reserve
Ghana Boin River Forest Reserve
Ghana Bosomtwe Range Forest Reserve
Ghana Bura River Forest Reserve
Ghana Cape Three Points Forest Reserve
Ghana Dadieso Forest Reserve
Ghana Draw River Forest Reserve
Ghana Ebi River Shelterbelt Forest Reserve
Ghana Fure River Forest Reserve
Ghana Jema-Asemkrom Forest Reserve
Ghana Kakum National Park - Assin Attandaso Resource Reserve
Ghana Mamiri Forest Reserve
Ghana Nsuensa Forest Reserve
Ghana Pra-Sushien Forest Reserve
Ghana Subri River Forest Reserve
Ghana Tano-Anwia Forest Reserve
Ghana Tano-Ehuro Forest Reserve
Ghana Tano-Nimiri Forest Reserve
Ghana Tano-Offin Forest Reserve
Ghana Yoyo River Forest Reserve
Guinea Massif du Ziama
Guinea Monts Nimba (part of Mount Nimba transboundary AZE)
Equatorial Guinea Monte Alen National Park
Liberia Wonegizi mountains
Liberia Lofa-Gola-Mano Complex
Liberia Nimba mountains
Liberia Zwedru
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 Cross River National Park (Okwangwo Division) and Mbe Mountains
Sierra Leone Loma Mountains Non-hunting Forest Reserve
Sierra Leone Kangari Hills Non-hunting Forest Reserve
Sierra Leone Kambui Hills Forest Reserve
Sierra Leone Gola Forests
Togo Misahöhe Forest Reserve

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude   Occasional altitudinal limits  

Recommended citation
BirdLife International (2022) Species factsheet: Horizocerus granti. Downloaded from http://www.birdlife.org on 09/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 09/12/2022.