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Sugarbird
The sugarbirds make up a small genus, ''Promerops'', and the family Promeropidae, of passerine birds which are restricted to southern Africa. In general appearance as well as habits they resemble large long-tailed sunbirds, but are possibly more closely related to the Australian honeyeaters. They have brownish plumage, the long downcurved bill typical of passerine nectar feeders, and long tail feathers.
==Taxonomy==
The relationships of the sugarbirds have been the source of considerable debate. They were first treated as a far-flung member of the honeyeater family, which is otherwise restricted to the Australasian region. Looking at egg white proteins in the 1970s Sibley and Ahlquist mistakenly placed them with the starlings (the samples used were actually those of sunbirds). They have also been linked to the thrushes (Turdidae) and the sunbirds. Molecular studies find support for few close relatives, and they are treated as a family at present,〔 although it now is usually determined they form a clade with three enigmatic species. These species, from the mountains of East Africa, were formerly placed in the large taxon that includes the Old World babblers.〔Beresford, P.; Barker, F.K.; Ryan, P.G. & Crowe, T.M. (2005): African endemics span the tree of songbirds (Passeri): molecular systematics of several evolutionary 'enigmas'. ''Proc. Roy. Soc. Lond. B'' 272(1565): 849–858. PMID 15888418 (PDF fulltext ) (Electronic appendix )〕 Recent studies indicate the family to be monotypic.
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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