• 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.
Olsson, U.; Alström, P.; Ericson, P. G. P.; Sundberg, P. 2005. Non-monophyletic taxa and cryptic species - evidence from a molecular phylogeny of leaf-warblers (Phylloscopus, Aves). Molecular Phylogenetics and Evolution 36: 261-276.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
2016	Least Concern
2013	Least Concern
2012	Least Concern
2009	Least Concern
2008	Least Concern
2006	Least Concern
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	altitudinal migrant	Forest dependency	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	3,840,000 km2
Extent of Occurrence (non-breeding)	4,430,000 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	stable	-	suspected	-
Generation length	2.86 years	-	-	-

Population justification: The global population size has not been quantified, but the species is described as common and widespread in most of its range (del Hoyo et al. 2006). The population is suspected to be stable in the absence of evidence for any declines or substantial threats. This species' population in Laos is considered to be of high importance globally, with trends in this country (low to negligible) similar to those found in the species' previous global assessment (Timmins et al. 2024). This species is considered to have a medium dependency on forest habitat, which is estimated to be declining at a slow rate (Global Forest Watch 2024).

Trend justification: The population is suspected to be stable in the absence of evidence for any declines or substantial threats.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Bangladesh	extant	native			yes
Bhutan	extant	native
Cambodia	extant	native
China (mainland)	extant	native
India	extant	native
Laos	extant	native
Myanmar	extant	native
Nepal	extant	native
Pakistan	extant	native		yes
Thailand	extant	native
Vietnam	extant	native

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Arable Land	suitable	non-breeding
Forest	Subtropical/Tropical Moist Lowland	suitable	non-breeding
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Shrubland	Subtropical/Tropical High Altitude	suitable	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude	0 - 3760 m	Occasional altitudinal limits	(max) 3700 m

Purpose	Scale
Food - human	subsistence, national
Pets/display animals, horticulture	subsistence, national

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Recommended citation
BirdLife International (2024) Species factsheet: Blyth's Leaf-warbler Phylloscopus reguloides. Downloaded from https://datazone.birdlife.org/species/factsheet/blyths-leaf-warbler-phylloscopus-reguloides on 18/12/2024.
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 18/12/2024.