Data Zone
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 |
|---|---|---|
| 2021 | Least Concern | |
| 2019 | Least Concern | |
| 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 | medium |
| Land-mass type | Average mass | 11 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 3,050,000 km2 | medium |
| Extent of Occurrence (non-breeding) | 1,170,000 km2 | medium |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | 9500000 mature individuals | poor | estimated | 2019 |
| Population trend | stable | - | estimated | - |
| Generation length | 2.1 years | - | - | - |
Population justification: The global population is estimated to number 9,500,000 mature individuals (Partners in Flight 2019).
Trend justification: The species has stable population trends (Partners in Flight 2019; Rosenberg et al. 2019).
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Canada | extant | native | yes | |||
| Mexico | extant | native | yes | yes | yes | |
| USA | extant | native | yes | yes |
| Country/Territory | IBA Name |
|---|
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Boreal | major | breeding |
| Forest | Subtropical/Tropical Dry | suitable | non-breeding |
| Forest | Subtropical/Tropical Moist Lowland | major | non-breeding |
| Forest | Subtropical/Tropical Moist Lowland | major | breeding |
| Forest | Subtropical/Tropical Moist Montane | major | non-breeding |
| Forest | Temperate | major | breeding |
| Wetlands (inland) | Permanent Rivers/Streams/Creeks (includes waterfalls) | suitable | breeding |
| Altitude | 1500 - 3500 m | Occasional altitudinal limits |
Recommended citation
BirdLife International (2024) Species factsheet: Pacific-slope Flycatcher Empidonax difficilis. Downloaded from
https://datazone.birdlife.org/species/factsheet/pacific-slope-flycatcher-empidonax-difficilis 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.