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Horned owl
The American (North and South America) horned owls and the Old World eagle-owls make up the genus ''Bubo'', at least as traditionally described. This genus, depending on definition, contains about one or two dozen species of typical owls (family Strigidae) and is found in many parts of the world. Some of the largest living Strigiformes are in ''Bubo''. Traditionally, only owls with ear-tufts were included in this genus, but that is no longer the case.
==Systematics==
Mitochondrial DNA (mtDNA) cytochrome ''b'' sequence data supports the decision to consider the snowy owl an eagle-owl adapted to Arctic conditions and moving it into ''Bubo'', rendering the monotypic genus ''Nyctea'' invalid.〔Olsen ''et al.'' (2002)〕
The four fish-owls previously in the genus ''Ketupa'' were provisionally moved into ''Bubo'' as well.〔König ''et al.'' (1999)〕 However, the mtDNA cytochrome ''b'' data suggests that in this case, to make ''Bubo'' monophyletic the ''Scotopelia'' fishing owls would also need to be included there. On the other hand, the genus then becomes quite large and ill-defined, and ''Bubo'' in the expanded sense seems to consist of two distinct clades. Thus, the fish and fishing owls can alternatively be united in ''Ketupa'' if some aberrant eagle-owls – at least the barred, spot-bellied and Usambara eagle-owls, perhaps also Fraser's eagle-owl and maybe others – are moved into that genus too. As some enigmatic eagle-owls remain essentially unstudied and others – e.g. Verreaux's eagle-owl – are of unresolved relationships, more research is needed.〔
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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