• 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
2013	Least Concern
2012	Least Concern
2010	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	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	1,780,000 km2
Extent of Occurrence (non-breeding)	614,000 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.52 years	-	-	-

Population justification: The global population size has not been quantified, but the species is reported to be rather local and thinly distributed (Baker 1997; G. Carey in litt. 2010), while the population in China has been estimated at c.100-10,000 breeding pairs and c.50-1,000 individuals on migration (Brazil 2009). This species is considered to have a medium dependency on forest habitat, and tree cover is estimated to have declined by 8.7% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Therefore, as a precautionary measure, it is tentatively suspected that this loss of cover may have led to a decline of between 1-19% in the species' population size over the same time frame.

Trend justification:   .

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
China (mainland)	extant	native
Laos	extant	native				yes
Thailand	extant	native
Vietnam	extant	native

Country/Territory	IBA Name
Laos	Dong Kalo
Laos	Eastern Bolikhamxay Mountains
Laos	Nakai Plateau
Vietnam	Sinh Long

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Plantations	marginal	resident
Artificial/Terrestrial	Rural Gardens	marginal	resident
Forest	Subtropical/Tropical Moist Lowland	suitable	non-breeding
Forest	Temperate	major	breeding
Shrubland	Subtropical/Tropical Dry	suitable	non-breeding
Shrubland	Temperate	suitable	breeding
Altitude	0 - 1890 m	Occasional altitudinal limits

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Sulphur-breasted Warbler Phylloscopus ricketti. Downloaded from https://datazone.birdlife.org/species/factsheet/sulphur-breasted-warbler-phylloscopus-ricketti on 23/11/2024.
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 23/11/2024.