LC
Olive Ibis Bostrychia olivacea



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
- - -

Red List history
Year Category Criteria
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
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 high
Land-mass type Average mass -
Range

Estimate Data quality
Extent of Occurrence (breeding/resident) 4,700,000 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 3000-45000 mature individuals poor estimated 2009
Population trend decreasing - suspected -
Generation length 10.1 years - - -

Trend justification: The overall population trend is decreasing, although some populations have unknown trends (Wetlands International 2006).


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Cameroon extant native yes
Congo extant native yes
Congo, The Democratic Republic of the extant native yes
Côte d'Ivoire extant native yes
Equatorial Guinea extant uncertain yes
Gabon extant native yes
Ghana extant native yes
Kenya extant native yes
Liberia extant native yes
São Tomé e Príncipe extant native yes
Sierra Leone extant native yes
Tanzania extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable resident
Forest Subtropical/Tropical Moist Lowland suitable resident
Forest Subtropical/Tropical Moist Montane suitable resident
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) major resident
Altitude 0 - 3700 m Occasional altitudinal limits  

Recommended citation
BirdLife International (2024) Species factsheet: Bostrychia olivacea. Downloaded from https://datazone.birdlife.org/species/factsheet/olive-ibis-bostrychia-olivacea on 05/03/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org on 05/03/2024.