Data Zone
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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.
| 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 | not a migrant | Forest dependency | Medium |
| Land mass type | Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 16,300,000 | medium |
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | poor | estimated | 2009 | |
| Population trend | Increasing | estimated | - | |
| 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) | 9.6 | - | - | - |
Trend justification: This species has undergone a large and statistically significant increase over the last 40 years in North America (86.7% increase over 40 years, equating to a 16.8% increase per decade; data from Breeding Bird Survey and/or Christmas Bird Count: Butcher and Niven 2007).
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Bermuda (to UK) | V | Extant | Yes | |||
| Canada | N | Extant | Yes | |||
| Mexico | N | Extant | Yes | |||
| USA | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Mexico | Acahuizotla - Agua del Obispo |
| Mexico | El Carricito |
| Mexico | Guacamayita |
| Mexico | La Malinche |
| Mexico | Omiltemi |
| Mexico | Tancítaro |
| Mexico | Sierra de Miahuatlán |
| Mexico | Sierra de Taxco - Nevado de Toluca |
| Mexico | Sierra de Manantlán |
| Mexico | Sierra de Atoyac y Bosques de Niebla de la Costa Grande |
| Mexico | Parque Natural Sierra de Nanchititla |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Rural Gardens | suitable | resident |
| Artificial/Terrestrial | Urban Areas | suitable | resident |
| Forest | Boreal | major | resident |
| Forest | Subtropical/Tropical Dry | suitable | resident |
| Forest | Subtropical/Tropical Moist Montane | suitable | resident |
| Forest | Temperate | suitable | resident |
| Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | suitable | resident |
| Wetlands (inland) | Permanent Rivers/Streams/Creeks (includes waterfalls) | suitable | resident |
| Wetlands (inland) | Seasonal/Intermittent Freshwater Lakes (over 8ha) | suitable | resident |
| Wetlands (inland) | Seasonal/Intermittent/Irregular Rivers/Streams/Creeks | suitable | resident |
| Altitude | 1300 - 3100 m | Occasional altitudinal limits |
Recommended citation
BirdLife International (2023) Species factsheet: Strix varia. Downloaded from
http://www.birdlife.org on 24/03/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 24/03/2023.
