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Biak White-eye Zosterops mysorensis
BirdLife is updating this factsheet for the 2016 Red List
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This species has a highly restricted and fragmented range, and is apparently now scarce and local, suggesting that it has declined. Although it is apparently tolerant of secondary habitats, it may have been affected negatively by logging and forest clearance. It is considered Near Threatened, and further studies are urgently needed in order to clarify the current magnitude of threats facing it.

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
Zosterops mysorensis is endemic to the twin islands of Biak-Supiori off Papua (formerly Irian Jaya), Indonesia (Beehler et al. 1986), where it has been described as "abundant in small flocks" of 3-12 birds (Bishop 1982). However, more recent visits have recorded it in small numbers (N. Bostock in litt. 1993, Eastwood 1996a, B. Beehler and S. van Balen in litt. 2000, K. D. Bishop in litt. 2000) or failed to find this species (Gibbs 1993, M. van Beirs in litt. 2000).

Population justification
This is a poorly known species and no population estimates are available.

Trend justification
Data on trends are lacking, but this species is apparently now scarce within its range, and is suspected to have declined as a result of habitat loss.

This species occurs in forest up to 675 m, including forest edge, secondary forest, and even low secondary growth (Bishop 1982, K. D. Bishop in litt. 2000).

On Biak, forest is under heavy threat from logging and subsistence farming, but there appears to be large areas of forest remaining in interior Supiori (Bishop 1982, K. D. Bishop in litt. 1996, D. Holmes in litt. 2000).

Conservation Actions Underway
This species occurs in the 110 km2 Biak-Utara protected area (B. Beehler and S. van Balen in litt. 2000). Conservation Actions Proposed
Conduct regular surveys to monitor populations and habitat trends on Biak and Supiori. Conduct ecological studies to identify habitat requirements and determine whether this species is genuinely able to persist solely in degraded habitats. Effectively protect the the Biak-Utara protected area.

Beehler, B. M.; Pratt, T. K.; Zimmerman, D. A. 1986. Birds of New Guinea. Princeton University Press, Princeton.

Bishop, K. D. 1982. Endemic birds of Biak Island.

Eastwood, C. 1996. A trip to Irian Jaya. Muruk 8(1): 12-23.

Gibbs, D. 1993. Irian Jaya, Indonesia, 21 January--12 March 1991: a site guide for birdwatchers, with brief notes from 1992.

Further web sources of information
Detailed species accounts from the Threatened birds of Asia: the BirdLife International Red Data Book (BirdLife International 2001).

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
Benstead, P., Gilroy, J., Khwaja, N. & Mahood, S.

Beehler, B., Bishop, K., Bostock, N., Holmes, D., van Balen, B. & van Beirs, M.

IUCN Red List evaluators
Butchart, S., Symes, A.

Recommended citation
BirdLife International (2016) Species factsheet: Zosterops mysorensis. Downloaded from on 25/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 25/10/2016.

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 Near Threatened
Family Zosteropidae (White-eyes)
Species name author Meyer, 1874
Population size Unknown mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 2,300 km2
Country endemic? Yes
Links to further information
- Additional Information on this species