Data Zone
Taxonomic note
Geranoaetus polyosoma (del Hoyo and Collar 2014) was previously placed in the genus Buteo. Buteo poecilochrous (Sibley and Monroe 1990, 1993; Stotz et al. 1996) was also lumped with B. polyosoma following SACC (2006).
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.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2024 | Least Concern | |
| 2016 | Least Concern | |
| 2012 | Least Concern | |
| 2009 | Least Concern | |
| 2008 | Not Recognised | |
| 2004 | Not Recognised | |
| 2000 | Not Recognised | |
| 1994 | Not Recognised | |
| 1988 | Not Recognised |
| Migratory status | full migrant | Forest dependency | low |
| Land-mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 13,800,000 km2 | medium |
| Extent of Occurrence (non-breeding) | 14,400,000 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | unknown | - | - | - |
| Population trend | stable | poor | observed | - |
| Generation length | 8.4 years | - | - | - |
Population justification: The global population size has not been quantified, but this species is described as 'fairly common' (Stotz et al. 1996).
The population is thought to be relatively secure and locally common, although suspected to be decreasing locally in Ecuador, Chile and Argentina (Ferguson-Lees and Christie 2001, del Hoyo et al. 2014).Trend justification: The population is suspected to be decreasing locally in Ecuador, Chile and Argentina (Ferguson-Lees and Christie 2001).
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Argentina | extant | native | yes | |||
| Bolivia | extant | native | yes | |||
| Brazil | extant | vagrant | ||||
| Chile | extant | native | yes | |||
| Colombia | extant | native | yes | |||
| Ecuador | extant | native | yes | |||
| Falkland Islands (Malvinas) | extant | native | yes | |||
| Paraguay | extant | native | yes | |||
| Peru | extant | native | yes | |||
| Uruguay | extant | native | yes |
| Country/Territory | IBA Name |
|---|
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Arable Land | suitable | non-breeding |
| Artificial/Terrestrial | Arable Land | suitable | breeding |
| Forest | Subtropical/Tropical Dry | suitable | non-breeding |
| Forest | Subtropical/Tropical Dry | suitable | breeding |
| Forest | Temperate | suitable | non-breeding |
| Forest | Temperate | suitable | breeding |
| Grassland | Subtropical/Tropical High Altitude | suitable | non-breeding |
| Grassland | Subtropical/Tropical High Altitude | suitable | breeding |
| Grassland | Temperate | suitable | non-breeding |
| Grassland | Temperate | suitable | breeding |
| Rocky areas (eg. inland cliffs, mountain peaks) | suitable | non-breeding | |
| Rocky areas (eg. inland cliffs, mountain peaks) | suitable | breeding | |
| Shrubland | Subtropical/Tropical Dry | suitable | non-breeding |
| Shrubland | Subtropical/Tropical Dry | suitable | breeding |
| Shrubland | Subtropical/Tropical High Altitude | suitable | non-breeding |
| Shrubland | Subtropical/Tropical High Altitude | suitable | breeding |
| Shrubland | Subtropical/Tropical Moist | suitable | non-breeding |
| Shrubland | Subtropical/Tropical Moist | suitable | breeding |
| Altitude | 0 - 5000 m | Occasional altitudinal limits |
Recommended citation
BirdLife International (2024) Species factsheet: Variable Hawk Geranoaetus polyosoma. Downloaded from
https://datazone.birdlife.org/species/factsheet/variable-hawk-geranoaetus-polyosoma 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.