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Black-backed bittern
The black-backed bittern (''Ixobrychus dubius''), also known as the black-backed least bittern or Australian little bittern, is a little-known species of heron in the family Ardeidae found in Australia and southern New Guinea. Formerly lumped with the little bittern, it is one of the smallest herons in the world.
==Taxonomy==
The bittern has sometimes been regarded as a subspecies of the little bittern (''Ixobrychus minutus''), or of the New Zealand little bittern (''Ixobrychus novaezelandiae''). However, molecular evidence has shown that it is more closely related to the yellow bittern (''Ixobrychus sinensis'') than to the African and Palaearctic forms of the little bittern and is now recognised as a full species.〔Christidis & Boles (2008), p.108.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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