Data Zone
Taxonomic note
Zimmerius improbus and Z. petersi (del Hoyo and Collar 2016) were previously lumped as Z. improbus following Sibley and Monroe (1990, 1993).
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 |
|---|---|---|
| 2016 | Least Concern |
| Migratory status | not a migrant | Forest dependency | High |
| Land mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 116,000 | medium |
| Number of locations | - | |
| Severely Fragmented | - |
| 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) | 3.6 | - | - | - |
Population justification: The global population size has not been quantified, but prior to being split from Z. petersi the species was described as uncommon to common (del Hoyo et al. 2004).
Trend justification: Deforestation has been severe in parts of this species's range (del Hoyo et al. 2004), thus the population is suspected to be in decline.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Colombia | N | Extant | Yes | |||
| Venezuela | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Colombia | Cuchilla de San Lorenzo |
| Colombia | Cerro Pintado (Serranía de Perijá) |
| Venezuela | Parque Nacional El Tamá |
| Venezuela | Parque Nacional Sierra Nevada |
| Venezuela | Parque Nacional Sierra La Culata |
| Venezuela | Parque Nacional Guaramacal |
| Venezuela | Parque Nacional Páramos Batallón y La Negra and surrounding areas |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Subtropical/Tropical Heavily Degraded Former Forest | suitable | resident |
| Forest | Subtropical/Tropical Moist Lowland | suitable | resident |
| Forest | Subtropical/Tropical Moist Montane | major | resident |
| Altitude | 400 - 3000 m | Occasional altitudinal limits |
Recommended citation
BirdLife International (2022) Species factsheet: Zimmerius improbus. Downloaded from
http://www.birdlife.org on 26/05/2022.
Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 26/05/2022.
