Data Zone
Taxonomic note
Sittasomus griseicapillus and S. griseus (del Hoyo and Collar 2016) were previously lumped as S. griseicapillus following AOU (1998 & supplements), SACC (2005 & updates), Sibley & Monroe (1990, 1993) and Stotz et al. (1996).
Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2022 | Least Concern | |
| 2016 | 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 | medium |
| Land-mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 7,130,000 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | unknown | - | unknown | - |
| Population trend | decreasing | - | suspected | 2016-2026 |
| Rate of change over the past 10 years/3 generations (longer of the two periods) | 1-19% | - | - | - |
| Rate of change over the future 10 years/3 generations (longer of the two periods) | 1-19% | - | - | - |
| Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 1-19% | - | - | - |
| Generation length | 3.47 years | - | - | - |
Population justification: The global population size is unknown given recent taxonomic splits.
Trend justification: The population trend has not been investigated, but the species is suspected to decline as a consequence of habitat loss. Tree cover within the range is lost at a rate of 8% over three generations (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Despite being largely dependent on forests, the species is also found in woodland and scrubby habitat (Patten 2020). Therefore, population declines may be roughly equivalent to the rate of tree cover loss; they are here placed in the band 1-19% over three generations.
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Belize | extant | native | yes | |||
| Colombia | extant | native | yes | |||
| Costa Rica | extant | native | yes | |||
| El Salvador | extant | native | yes | |||
| Guatemala | extant | native | yes | |||
| Honduras | extant | native | yes | |||
| Mexico | extant | native | yes | |||
| Nicaragua | extant | native | yes | |||
| Panama | extant | native | yes | |||
| Peru | extant | native | yes | |||
| Trinidad and Tobago | extant | native | yes | |||
| Venezuela | extant | native | yes |
| Country/Territory | IBA Name |
|---|
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Plantations | suitable | resident |
| Artificial/Terrestrial | Subtropical/Tropical Heavily Degraded Former Forest | suitable | resident |
| Forest | Subtropical/Tropical Dry | suitable | resident |
| Forest | Subtropical/Tropical Mangrove Vegetation Above High Tide Level | suitable | resident |
| Forest | Subtropical/Tropical Moist Lowland | major | resident |
| Forest | Subtropical/Tropical Moist Montane | suitable | resident |
| Forest | Subtropical/Tropical Swamp | suitable | resident |
| Savanna | Dry | suitable | resident |
| Shrubland | Subtropical/Tropical Dry | suitable | resident |
| Altitude | 0 - 2000 m | Occasional altitudinal limits | (max) 2300 m |
Recommended citation
BirdLife International (2025) Species factsheet: Western Olivaceous Woodcreeper Sittasomus griseus. Downloaded from
https://datazone.birdlife.org/species/factsheet/western-olivaceous-woodcreeper-sittasomus-griseus on 18/01/2025.
Recommended citation for factsheets for more than one species: BirdLife International (2025) IUCN Red List for birds. Downloaded from
https://datazone.birdlife.org/species/search on 18/01/2025.