Data Zone
Taxonomic note
Taxonomic source(s)
AOU. 1998. Check-list of North American birds. American Ornithologists' Union, Washington, D.C.
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.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.
Stotz, D. F.; Fitzpatrick, J. W.; Parker, T. A.; Moskovits, D. K. 1996. Neotropical birds: ecology and conservation. University of Chicago Press, Chicago.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| 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 |
| Migratory status | full migrant | Forest dependency | low |
| Land-mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 13,400,000 km2 | medium |
| Extent of Occurrence (non-breeding) | 9,070,000 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | unknown | poor | estimated | 2009 |
| Population trend | increasing | - | estimated | - |
| Generation length | 3.4 years | - | - | - |
Trend justification: This species has undergone a small or statistically insignificant increase over the last 40 years in North America (data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Bahamas | extant | native | ||||
| Belize | extant | native | yes | |||
| Canada | extant | native | ||||
| Cayman Islands (to UK) | extant | native | ||||
| Cuba | extant | native | ||||
| Dominican Republic | extant | vagrant | yes | |||
| El Salvador | extant | native | ||||
| Guatemala | extant | native | ||||
| Honduras | extant | native | ||||
| Mexico | extant | native | ||||
| Nicaragua | extant | native | ||||
| St Pierre and Miquelon (to France) | extant | vagrant | yes | |||
| Turks and Caicos Islands (to UK) | extant | native | ||||
| USA | extant | native | yes |
| Country/Territory | IBA Name |
|---|
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Subtropical/Tropical Heavily Degraded Former Forest | suitable | non-breeding |
| Artificial/Terrestrial | Subtropical/Tropical Heavily Degraded Former Forest | suitable | breeding |
| Forest | Subtropical/Tropical Dry | major | non-breeding |
| Forest | Subtropical/Tropical Dry | major | breeding |
| Forest | Subtropical/Tropical Mangrove Vegetation Above High Tide Level | suitable | non-breeding |
| Forest | Subtropical/Tropical Moist Lowland | suitable | breeding |
| Forest | Subtropical/Tropical Moist Lowland | suitable | non-breeding |
| Forest | Subtropical/Tropical Swamp | suitable | non-breeding |
| Forest | Temperate | major | breeding |
| Savanna | Dry | suitable | breeding |
| Savanna | Dry | suitable | non-breeding |
| Shrubland | Subtropical/Tropical Dry | suitable | breeding |
| Shrubland | Subtropical/Tropical Dry | suitable | non-breeding |
| Shrubland | Temperate | suitable | breeding |
| Altitude | 0 - 1000 m | Occasional altitudinal limits | (max) 2100 m |
Recommended citation
BirdLife International (2024) Species factsheet: Blue-grey Gnatcatcher Polioptila caerulea. Downloaded from
https://datazone.birdlife.org/species/factsheet/blue-grey-gnatcatcher-polioptila-caerulea 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.