Zosterops hypolais


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Zosterops hypolais
Species Authority: Hartlaub & Finsch, 1872
Common Name(s):
English Plain White-eye

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Derhé, M., Mahood, S., O'Brien, A., Shutes, S.
This species has an extremely small range on one small group of islands where it is currently common. The range is not yet severely fragmented or restricted to few locations. For these reasons, the species is classified as Near Threatened. However, it could decline rapidly if alien predators such as brown tree snake Boiga irregularis were introduced, and would then warrant uplisting to a higher threat category.

Geographic Range [top]

Range Description: Zosterops hypolais is endemic to the four islands of Yap, Federated States of Micronesia, where it is common, and, in 1984, was estimated to have a population of 86,864 individuals (Engbring et al. 1990).

Micronesia, Federated States of
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Engbring et al. (1990) estimated the population to number 86,864 individuals, which is rounded to 86,900 individuals here.
Population Trend: Stable

Habitat and Ecology [top]

Habitat and Ecology: It is found in nearly all forest and vegetation types, including brushy thickets in open savannas and meadows.

Systems: Terrestrial

Threats [top]

Major Threat(s): It appears to be in no particular danger but, given its small range, it will always be at some risk from stochastic events, including exotic introductions such as the brown tree snake Boiga irregularis, which has caused the extirpation and extinction of birds on Guam (to USA) (Engbring et al. 1990).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
None is known.

Conservation Actions Proposed
Periodically monitor populations to establish trends. Take measures to ensure B. irregularis never reaches Yap.

Citation: BirdLife International 2012. Zosterops hypolais. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 31 August 2015.
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