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Sulphur-breasted Warbler Phylloscopus ricketti
BirdLife is updating this factsheet for the 2016 Red List
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This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population trend appears to be stable, and hence the species does not approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Taxonomic source(s)
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Distribution and population
Phylloscopus ricketti is native to China, Laos, Vietnam and Thailand. It may be fairly widespread but extremely localised during the breeding season in China (P. Leader in litt. 2007, G. Carey in litt. 2010).

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).

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

This species primarily inhabits forests, but it has also been recorded in open, somewhat degraded woodland and scrubland with scattered conifers, and in gardens and tea plantations adjacent to close-canopy secondary forest (P. Leader in litt. 2007, G. Carey in litt. 2010). It may inhabitat a fairly narrow altitudinal range (800-1,100 m) (G. Carey in litt. 2010).

Baker, K. 1997. Warblers of Europe, Asia and North Africa. Princeton University Press, Princeton.

Brazil, M. 2009. Birds of East Asia: eastern China, Taiwan, Korea, Japan, eastern Russia. Christopher Helm, London.

Further web sources of information
Explore HBW Alive for further information on this species

Search for photos and videos, and hear sounds of this species from the Internet Bird Collection

Text account compilers
Ekstrom, J., Butchart, S., Harding, M.

Carey, G.

Recommended citation
BirdLife International (2016) Species factsheet: Phylloscopus ricketti. Downloaded from on 27/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 27/10/2016.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Least Concern
Family Sylviidae (Old World warblers)
Species name author (Slater, 1897)
Population size Unknown mature individuals
Population trend Stable
Distribution size (breeding/resident) 1,630,000 km2
Country endemic? No
Links to further information
- Additional Information on this species