• 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
2019	Near Threatened	B1ab(ii,iii,v)+2ab(ii,iii,v); D2
2016	Near Threatened	B1ab(iii,v);D2
2012	Near Threatened	B1ab(iii,v);D2
2008	Near Threatened	B1a+b(iii,v); D2
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Lower Risk/Least Concern

Migratory status	not a migrant	Forest dependency	high
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	1,100 km2	medium
Area of Occupancy (breeding/resident)	242 km2
Number of locations	11-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	9200-9300 mature individuals	poor	unknown	1991
Population trend	decreasing	poor	suspected	2012-2025
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Generation length	4.4 years	-	-	-

Population justification: Engbring (1992) estimated the total population to number 13,876 individuals, which is rounded here to 13,900 individuals. This is roughly equivalent to 9,200-9,300 mature individuals. No more recent population estimates are available for this species.

Trend justification: The population trend has not been quantified directly. The species is suspected to be in decline as a result of habitat degradation and loss. Ongoing deforestation has resulted in a significant loss of habitable area for the species with only very limited forest remaining throughout its range (Tracewski et al. 2016). Consequently, the population of mature individuals is suspected to be in slow decline at a rate of <20% over three generations.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Palau	extant	native		yes

Country/Territory	IBA Name
Palau	Peleliu
Palau	Rock Islands

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
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, Ecosystem conversion
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Boiga irregularis	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Rapid Declines		Medium Impact: 6
		Stresses Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Giant White-eye Megazosterops palauensis. Downloaded from https://datazone.birdlife.org/species/factsheet/giant-white-eye-megazosterops-palauensis 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.