Data Zone
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. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2024 | Least Concern | |
| 2016 | Least Concern | |
| 2014 | Least Concern | |
| 2012 | Not Recognised | |
| 2008 | Not Recognised | |
| 2004 | Not Recognised | |
| 2000 | Not Recognised | |
| 1994 | Not Recognised | |
| 1988 | Not Recognised |
| Migratory status | not a migrant | Forest dependency | high |
| Land-mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 2,550,000 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | unknown | - | - | - |
| Population trend | decreasing | - | suspected | - |
| Generation length | 4.27 years | - | - | - |
Population justification: The global population size has not been quantified, but the species is reported to be locally common (del Hoyo et al. 2001). This species is considered to have a high dependency on forest habitat, and tree cover is estimated to have declined by 11.9% within its mapped range over the past three generations (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). It is therefore tentatively suspected that this rate of cover loss may have led to a decline of between 1-19% in the species' population size over the same time frame, with a best estimate of reduction being 11-14%.
Trend justification: .
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Cameroon | extant | native | yes | |||
| Central African Republic | extant | native | yes | |||
| Congo | extant | native | yes | |||
| Côte d'Ivoire | extant | native | yes | |||
| Equatorial Guinea | extant | native | yes | |||
| Gabon | extant | native | yes | |||
| Ghana | extant | native | yes | |||
| Guinea | extant | native | yes | |||
| Liberia | extant | native | yes | |||
| Nigeria | extant | native | yes | |||
| Sierra Leone | extant | native | yes | |||
| Togo | extant | native | yes |
| Country/Territory | IBA Name |
|---|---|
| Central African Republic | Zémongo Faunal Reserve |
| Congo | Conkouati National Park |
| Congo | Dimonika Biosphere Reserve |
| Congo | Lake Télé Community Reserve |
| Congo | Lower Kouilou basin |
| Congo, The Democratic Republic of the | Forests west of Lake Edward |
| Congo, The Democratic Republic of the | Kahuzi-Biega National Park |
| Congo, The Democratic Republic of the | Lomako - Yekokora |
| Congo, The Democratic Republic of the | Maiko National Park |
| Congo, The Democratic Republic of the | Mount Hoyo Reserve |
| Congo, The Democratic Republic of the | Ngiri |
| Congo, The Democratic Republic of the | Okapi Faunal Reserve |
| Congo, The Democratic Republic of the | Salonga National Park |
| Congo, The Democratic Republic of the | Virunga National Park |
| South Sudan | Bengangai |
| Uganda | Semliki National Park |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Moist Lowland | major | resident |
| Altitude | 500 - 1000 m | Occasional altitudinal limits |
Recommended citation
BirdLife International (2024) Species factsheet: Western Dwarf Hornbill Horizocerus hartlaubi. Downloaded from
https://datazone.birdlife.org/species/factsheet/western-dwarf-hornbill-horizocerus-hartlaubi on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 22/12/2024.