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Bonin Grosbeak Chaunoproctus ferreorostris
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This species was known from Japan's Ogasawara Islands, but it is now Extinct and has not been certainly reported since 1828. Forest destruction and predation by introduced species are thought to have been responsible.

Taxonomic source(s)
Brooks, T. 2000. Extinct species. In: BirdLife International (ed.), Threatened birds of the world, pp. 701-708. Lynx Edicions and BirdLife International, Barcelona and Cambridge, U.K.

Distribution and population
Chaunoproctus ferreorostris is only known from specimens collected in 1827 and 1828 on Chichi-jima, Ogasawara-shoto (Peel Island, Bonin), Japan (Brazil 1991). It could not be found on Peel by Simpson in 1854, and rumours that it may have survived until 1890, when it was reported to Holst by locals (Morjoka 1992), were never substantiated (Brazil 1991).

Nothing is known of its ecology (Morioka 1992) apart from Kittlitz's description (Greenway 1967), "this bird lives on Bonin-sima, alone or in pairs, in the forest near the coast. It is not common but likes to hide, although of a phlegmatic nature and not shy. Usually it is seen running on the ground, only seldom high in the trees."

It seems reasonable to surmise from its ecology that its extinction resulted from the deforestation of the islands, and the introduction of cats and rats (Stattersfield et al. 1998).

Brazil, M. A. 1991. The birds of Japan. Chistopher Helm, London.

Greenway, J. C. 1967. Extinct and vanishing birds of the world. Dover Publications, New York.

Morioka, H. 1992. Relationships of the Ogasawara Islands Grosbeak Chaunoproctus ferreorostris (Aves: Fringillidae). Bulletin of the National Science Museum Series A (Zoology) 18: 45-49.

Stattersfield, A. J.; Crosby, M. J.; Long, A. J.; Wege, D. C. 1998. Endemic bird areas of the world: priorities for bird conservation. BirdLife International, Cambridge, U.K.

Further web sources of information
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
Brooks, T., Khwaja, N. & Mahood, S.

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

Recommended citation
BirdLife International (2016) Species factsheet: Chaunoproctus ferreorostris. Downloaded from on 28/10/2016. Recommended citation for factsheets for more than one species: BirdLife International (2016) IUCN Red List for birds. Downloaded from on 28/10/2016.

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.

Additional resources for this species

ARKive species - Bonin grosbeak (Chaunoproctus ferreorostris) 0

Key facts
Current IUCN Red List category Extinct
Family Fringillidae (Finches and Hawaiian honeycreepers)
Species name author (Vigors, 1828)
Links to further information
- Additional Information on this species