• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
2016	Least Concern
2012	Least Concern
2009	Least Concern
2008	Least Concern
2005	Least Concern
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	not a migrant	Forest dependency	high
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	2,880,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	50000-499999 mature individuals	poor	suspected	2022
Population trend	decreasing	-	inferred	2017-2027
Rate of change over the past 10 years/3 generations (longer of the two periods)	15-19%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	15-19%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	15-19%	-	-	-
Generation length	2.29 years	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The global population is suspected to number 50,000-499,999 mature individuals (Partners in Flight 2022).

Trend justification: The species is becoming rarer in areas where forests are degraded and disturbed (Schafer 2020). Based on ongoing deforestation within the range a continuing decline is inferred (Partners in Flight 2022, Pollock et al. 2022, Global Forest Watch 2023).
Tree cover within the range is lost at a rate of 9-11% over ten years (Global Forest Watch 2023, using Hansen et al. [2013] data and methods disclosed therein). Due to the species' low tolerance of habitat degradation, population declines may be steeper than the rate of tree cover loss suggests. They are here tentatively placed in the band 15-19% over ten years.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Belize	extant	native	yes
Colombia	extant	native	yes
Costa Rica	extant	native	yes
Ecuador	extant	native	yes
Guatemala	extant	native	yes
Honduras	extant	native	yes
Mexico	extant	native	yes
Nicaragua	extant	native	yes
Panama	extant	native	yes
Peru	extant	native	yes

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	0 - 1420 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Agro-industry farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Sulphur-rumped Flycatcher Myiobius sulphureipygius. Downloaded from https://datazone.birdlife.org/species/factsheet/sulphur-rumped-flycatcher-myiobius-sulphureipygius on 26/11/2024.
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 26/11/2024.