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Black Oriole Oriolus hosii

Justification
This scarce and poorly known species has a highly restricted range, and is likely to have a moderately small global population size. Habitat loss is suspected to be causing slow population declines in parts of the range. It is therefore currently considered Near Threatened.

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
Oriolus hosii is endemic to Borneo. In Sarawak, Malaysia, it is restricted to montane forest at 900-2,000 m, and has been historically recorded from Gn Kalulong, Gn Mulu, Gn Dulit, the Usun Apau Plateau, Gn Derian, Gn Murud Kecil, Batang Patap, Ulu Sabai and Tutoh. The species was recently seen in  Sarawak for the first time since 1991, during an International Tropical Timber Organisation survey of Batu Lawi. It is also known from east Kalimantan, Indonesia, near to the border with Sarawak. It is rarely recorded and little is known; being usually noisy where it does occur, this paucity of records is thought to reflect genuine rarity (Orenstein et al. 2010).

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

Trend justification
Some habitat loss is occurring within the lower altitudinal range of this species, thus a slow population decline is likely to be taking place.

Ecology
This species is apparently restricted to mossy transitional forest around 1,100-1,200 m on the sandy north side of the Dulit range.

Threats
Habitat clearance through logging and agricultural development is now encroaching into montane areas within the species's range.

Conservation Actions Underway
It is known to occur within protected areas, including Kayan Mentarang National Park in east Kalimantan (Orenstein et al. 2010).

Conservation Actions Proposed
Conduct repeated surveys within its range to determine current distribution and abundance, as well as assess population trends and rates of habitat loss. Conduct ecological studies to improve understanding of its precise habitat requirements, tolerance of secondary habitats and response to fragmentation. Protect significant areas of suitable forest, in both strictly protected areas and community-led multiple use areas.

References
BirdLife International. 2001. Threatened birds of Asia: the BirdLife International Red Data Book. BirdLife International, Cambridge, U.K.

del Hoyo, J.; Elliott, A.; Christie, D. 2008. Handbook of the Birds of the World, vol. 13: Penduline-tits to Shrikes. Lynx Edicions, Barcelona, Spain.

Orenstein, R.; Wong, A.; Abghani, N.; Bakewell, D.; Eaton, J.; Teck, Y. S.; Li, Y. D. 2010. Sarawak - a neglected birding destination in Malaysia. BirdingASIA 13: 30-41.

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., Taylor, J.

Recommended citation
BirdLife International (2014) Species factsheet: Oriolus hosii. Downloaded from http://www.birdlife.org on 22/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/09/2014.

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 Oriolidae (Orioles and figbirds)
Species name author Sharpe, 1892
Population size Unknown mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 20,400 km2
Country endemic? No
Links to further information
- Additional Information on this species