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''Rhyticeros'' is a genus of medium to large hornbills (Bucerotidae family) found in forests from Southeast Asia to the Solomons. They are sometimes included in the genus ''Aceros''. On the other hand, most species generally placed in ''Aceros'' are sometimes moved to ''Rhyticeros'', leaving ''Aceros'' as a monotypic genus only containing the rufous-necked hornbill. All species generally placed in ''Rhyticeros'' have relatively low, conspicuously wreathed casques and a mainly dull whitish horn-colored bill. Both sexes have mainly black plumage, but the head and neck of the males are white or rufous. The tail is white except in the black-tailed Sumba hornbill. They have conspicuous inflatable skin on the throat, which is blue in all except the males of the plain-pouched and wreathed hornbills, where it is yellow. ==Species== As generally recognized, the following species belong in the genus ''Rhyticeros'': * Papuan (or Blyth's) hornbill (''Rhyticeros plicatus'') * Narcondam hornbill (''Rhyticeros narcondami'') * Plain-pouched hornbill (''Rhyticeros subruficollis'') * Wreathed hornbill (''Rhyticeros undulatus'') * Sumba hornbill (''Rhyticeros everetti'') An undescribed extinct hornbill species from Lifou in the Loyalty Islands, living until at least some 30,000 years ago, was initially placed in ''Aceros'', but its biogeography places it with the species now in ''Rhyticeros'' (Steadman, 2006). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rhyticeros」の詳細全文を読む スポンサード リンク
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