LC
Western Little Hornbill Horizocerus hartlaubi



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) 2,550,000 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), it 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
Cameroon N Extant Yes
Central African Republic N Extant Yes
Congo N Extant Yes
Côte d'Ivoire N Extant Yes
Equatorial Guinea N Extant Yes
Gabon N Extant Yes
Ghana N Extant Yes
Guinea N Extant Yes
Liberia N Extant Yes
Nigeria N Extant Yes
Sierra Leone N Extant Yes
Togo N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Congo, The Democratic Republic of the Ngiri
Congo, The Democratic Republic of the Salonga National Park
Congo, The Democratic Republic of the Lomako - Yekokora
Congo, The Democratic Republic of the Mount Hoyo Reserve
Congo, The Democratic Republic of the Okapi Faunal Reserve
Congo, The Democratic Republic of the Virunga National Park
Congo, The Democratic Republic of the Maiko National Park
Congo, The Democratic Republic of the Forests west of Lake Edward
Congo, The Democratic Republic of the Kahuzi-Biega National Park
Central African Republic Zémongo Faunal Reserve
South Sudan Bengangai
Uganda Semliki National Park
Congo Lake Télé Community 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 (2021) Species factsheet: Horizocerus hartlaubi. Downloaded from http://www.birdlife.org on 16/10/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 16/10/2021.