• 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
-	A2bcd+3bcd+4bcd	A2bcd+3bcd+4bcd

Red List history

Year	Category	Criteria
2021	Endangered	A2bcd+3bcd+4bcd
2019	Endangered	A2bd+3d+4bd
2016	Vulnerable	A2bd+3bd+4bd
2012	Near Threatened	B1ab(i,ii,iii,iv,v)
2008	Near Threatened	B1a+b(i,ii,iii,iv,v)
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	17,700 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	poor	inferred	2018-2028
Rate of change over the past 10 years/3 generations (longer of the two periods)	50-79%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	50-79%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	50-79%	-	-	-
Generation length	2.4 years	-	-	-

Population justification: The population size of this species has not been quantified, but given its localised distribution and apparent rapid declines in recent years it may be considerably smaller than previously assumed. During the ‘Big Month’ citizen science event (conducted in  January 2020 comprising 22,054 checklists) across Java and Bali for example, it was recorded in just 2 (0.04%) of the 7,935 tetrads (2 × 2 km squares) visited (T. Squires and S. Marsden in litt. 2020).

Trend justification: Populations have declined in numbers greatly at several sites throughout Java (Eaton et al. 2016) and the species has been completely lost from the majority of locations where it had previously been numerous (B. S. van Balen in litt. 2019). Formerly, the species was described as abundant (in a range of habitats), but during the ‘Big Month’ citizen science event (conducted in  January 2020 comprising 22,054 checklists) across Java and Bali for example, it was recorded in just 2 (0.04%) of the 7,935 tetrads (2 × 2 km squares) visited (T. Squires and S. Marsden in litt. 2020). The rate of decline has clearly accelerated with the domestic focus on trapping, but has likely been rapid or very rapid for the past decade. Additionally, the destruction and degradation of mangroves and other coastal forest habitat is estimated to have removed 15.2% of the species's habitat in the past 10 years (Symes et al. 2018).

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Indonesia	extant	native	yes
Malaysia	presence uncertain	uncertain

Country/Territory	IBA Name

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Mangrove Vegetation Above High Tide Level	suitable	resident
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Shrubland	Subtropical/Tropical Moist	suitable	resident
Altitude		Occasional altitudinal limits

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, Ecosystem conversion
Agriculture & aquaculture	Marine & freshwater aquaculture - Industrial aquaculture	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Rapid Declines		High Impact: 8
		Stresses Species disturbance, Species mortality
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation
Residential & commercial development	Housing & urban areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Scale
Pets/display animals, horticulture	international

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Recommended citation
BirdLife International (2024) Species factsheet: Javan White-eye Zosterops flavus. Downloaded from https://datazone.birdlife.org/species/factsheet/javan-white-eye-zosterops-flavus on 23/12/2024.
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 23/12/2024.