Justification of Red List Category
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.
No extant population remains.
Carpodacus ferreorostris is an Extinct taxon 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).
Text account compilers
Mahood, S., Brooks, T., Khwaja, N., Westrip, J.
BirdLife International (2017) Species factsheet: Carpodacus ferreorostris. Downloaded from http://www.birdlife.org on 17/10/2017. Recommended citation for factsheets for more than one species: BirdLife International (2017) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/10/2017.