LC
Pacific-slope Flycatcher Empidonax difficilis



Taxonomy

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.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
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
Species attributes

Migratory status full migrant Forest dependency medium
Land-mass type Average mass 11 g
Range

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 -
Population
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 distribution
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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
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: Empidonax difficilis. Downloaded from https://datazone.birdlife.org/species/factsheet/pacific-slope-flycatcher-empidonax-difficilis on 19/03/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org on 19/03/2024.