• 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
2004	Least Concern
2000	Lower Risk/Least Concern
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

Migratory status	full migrant	Forest dependency	high
Land-mass type		Average mass	11 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	1,280,000 km2
Extent of Occurrence (non-breeding)	1,670,000 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	2.44 years	-	-	-

Population justification: The global population size has not been quantified, though national population estimates include: c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in China; c.1,000-10,000 individuals on migration in Korea and c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Russia (Brazil 2009). This species is considered to have a high dependency on forest habitat, and tree cover is estimated to have declined by 5.9% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). It is therefore tentatively suspected that this rate of cover loss may have led to a decline of between 1-19% in the species' population size over the same time frame, with a best estimate of reduction being 5-9%.

Trend justification:   .

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Cambodia	extant	native
China (mainland)	extant	native
Hong Kong (China)	extant	native
Japan	extant	uncertain
Laos	extant	native
Myanmar	extant	native
North Korea	extant	native
Russia	extant	native
Russia (Asian)	extant	native
South Korea	extant	native
Thailand	extant	native
Vietnam	extant	native

Country/Territory	IBA Name
North Korea	Mount Kumgang
Russia (Asian)	Bolon' lake
Russia (Asian)	Kievka and Chernaya river basins
Russia (Asian)	Middle reaches of the Iman river
Russia (Asian)	Udyl' lake

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	suitable	non-breeding
Forest	Subtropical/Tropical Moist Lowland	suitable	breeding
Forest	Subtropical/Tropical Moist Montane	major	non-breeding
Forest	Temperate	major	breeding
Altitude	0 - 2950 m	Occasional altitudinal limits

Purpose	Scale
Pets/display animals, horticulture	subsistence, national

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Recommended citation
BirdLife International (2024) Species factsheet: Chestnut-flanked White-eye Zosterops erythropleurus. Downloaded from https://datazone.birdlife.org/species/factsheet/chestnut-flanked-white-eye-zosterops-erythropleurus 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.