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Yellow-bearded Greenbul Criniger olivaceus

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable A2c+3c+4c 

IUCN Red List history

Year Category
2012 Vulnerable
2008 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened

Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type continent
Average mass 28.1 g

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 231,000 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals poor Suspected 2007
Population trend Decreasing medium -
Number of subpopulations 2-100 - - -
Largest subpopulation - - -
Generation length (yrs) 3.5 - - -
Population justification: The total population is conservatively suspected to number somewhere in the region of 100,000-499,999 individuals based on a population of c.120,000 pairs in Liberia alone.
Trend justification: The population is suspected to be declining rapidly, in line with the clearance of forest within the species's range for commercial timber extraction and agriculture.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Côte d'Ivoire Native Extant       Yes
Ghana Native Extant       Yes
Guinea Native Extant       Yes
Liberia Native Extant       Yes
Sierra Leone Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Côte d'Ivoire Mabi Forest reserve site factsheet
Côte d'Ivoire Mopri Forest Reserve site factsheet
Côte d'Ivoire Mount Nimba Strict Nature Reserve site factsheet
Côte d'Ivoire Tai National Park and Nzo Faunal Reserve site factsheet
Côte d'Ivoire Yapo and Mambo Forest Reserves site factsheet
Ghana Ankasa Resource Reserve - Nini-Sushien National Park site factsheet
Ghana Atewa Range Forest Reserve site factsheet
Ghana Bia National Park and Resource Reserve site factsheet
Ghana Boin River Forest Reserve site factsheet
Ghana Boin Tano Forest Reserve site factsheet
Ghana Bura River Forest Reserve site factsheet
Ghana Cape Three Points Forest Reserve site factsheet
Ghana Dadieso Forest Reserve site factsheet
Ghana Draw River Forest Reserve site factsheet
Ghana Ebi River Shelterbelt Forest Reserve site factsheet
Ghana Fure River Forest Reserve site factsheet
Ghana Jema-Asemkrom Forest Reserve site factsheet
Ghana Kakum National Park - Assin Attandaso Resource Reserve site factsheet
Ghana Subri River Forest Reserve site factsheet
Ghana Tano-Anwia Forest Reserve site factsheet
Ghana Tano-Ehuro Forest Reserve site factsheet
Ghana Tano-Nimiri Forest Reserve site factsheet
Ghana Tano-Offin Forest Reserve site factsheet
Guinea Diécké site factsheet
Guinea Massif du Ziama site factsheet
Liberia Cestos - Senkwen site factsheet
Liberia Grebo site factsheet
Liberia Lofa-Gola-Mano Complex site factsheet
Liberia Nimba mountains site factsheet
Liberia Sapo site factsheet
Liberia Wologizi mountains site factsheet
Liberia Wonegizi mountains site factsheet
Liberia Zwedru site factsheet
Sierra Leone Gola Forest Reserve site factsheet
Sierra Leone Loma Mountains Non-hunting Forest Reserve site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 800 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting / Intentional use: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
None
Biological resource use Logging & wood harvesting / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2014) Species factsheet: Criniger olivaceus. Downloaded from http://www.birdlife.org on 27/11/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 27/11/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Vulnerable
Family Pycnonotidae (Bulbuls)
Species name author (Swainson, 1837)
Population size mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 231,000 km2
Country endemic? No
Links to further information
- Summary information on this species
- Projected distributions under climate change