• 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
-	-	A2c+3c+4c

Red List history

Year	Category	Criteria
2024	Vulnerable	A2c+3c+4c
2016	Vulnerable	A2c+3c+4c;C2a(i)
2012	Vulnerable	A2c+3c+4c;C2a(i)
2008	Vulnerable	A2c; A3c; A4c; C2a(i)
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	254,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	poor	inferred	2016-2026
Rate of change over the past 10 years/3 generations (longer of the two periods)	20-35%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	20-35%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	20-35%	-	-	-
Generation length	3.13 years	-	-	-
Number of subpopulations	8-20	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: Population size not estimated, but may be moderately small given its apparent scarcity. Described by Allen (2020) as scarce and eBird (2024) find this species to be among the least regularly encountered of Mindanao lowland endemics.

Trend justification: Direct population trend data are lacking for this species although it is considered to be highly forest-dependent notwithstanding the fact it has occasionally been observed feeding over degraded landscapes (Allen 2020). Over the past 10 years forest cover within its range has reduced by c. 19-26% (Global Forest Watch 2024, based on data from Hansen et al. [2013] and methods therein), depending on the elevational thresholds set (this species is mostly found <400 m). These figures also do not account for additional impacts of selective logging and degradation, with large tracts of forest in its range, particularly on Mindanao, now heavily modified (Grantham et al. 2020). Accordingly, forest cover trends alone are thought to represent the minimum value of likely population reduction over the same timeframe, which is suspected to be 20-35%. Annual rates of forest loss in the past five years have been similar to the years before then, such that rates of population reduction are thought likely to continue at the same rate over the next three generations, unless conservation action adequately safeguards the lowland forests upon which this species depends.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Philippines	extant	native	yes

Country/Territory	IBA Name
Philippines	Anonang-Lobi Range
Philippines	Basilan Natural Biotic Area
Philippines	Bislig
Philippines	Mount Agtuuganon and Mount Pasian
Philippines	Mount Busa-Kiamba
Philippines	Mount Cabalantian - Mount Capoto-an complex
Philippines	Mount Dapiak-Mount Paraya
Philippines	Mount Hilong-hilong
Philippines	Mount Kambinlio and Mount Redondo
Philippines	Mount Kampalili-Puting Bato
Philippines	Mount Malindang
Philippines	Mount Sugarloaf
Philippines	Mount Yacgun - Mount Sohoton complex
Philippines	Pasonanca watershed
Philippines	Southern Samar mountains

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	marginal	resident
Altitude	0 - 400 m	Occasional altitudinal limits	(max) 1200 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Rapid Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Wood & pulp plantations - Small-holder plantations	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Rapid Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Little Slaty Flycatcher Ficedula basilanica. Downloaded from https://datazone.birdlife.org/species/factsheet/little-slaty-flycatcher-ficedula-basilanica on 22/11/2024.
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 22/11/2024.