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Bonin grosbeak : ウィキペディア英語版 | Bonin grosbeak
The Bonin grosbeak or Bonin Islands grosbeak (''Carpodacus ferreorostris'') is an extinct finch. It is one of the diverse bird taxa that are vernacularly called "grosbeaks", but it is not closely related to the grosbeaks ''sensu stricto''. Many authorities place the species in the genus ''Carpodacus'', but some place it in its own genus, ''Chaunoproctus''. ==Behaviour== It was a retiring, although not shy bird, and was usually found singly or in pairs. It fed on fruits and buds which were primarily picked up from the ground or low shrubs; it rarely was observed to perch in trees, being apparently rather phlegmatic and somewhat reluctant to fly. Only one kind of vocalization has been described: a soft, pure and high note, sometimes short, sometimes drawn out; sometimes given singly, sometimes in a short series.
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