Astur (Nisus) gularis
Temminck and Schlegel, 1844,
Closely related to A. virgatus, of which has been considered a race. Recent phylogenetic analyses suggested that, unexpectedly, these two and A. fasciatus form a monophyletic group, this group being close to A. cirrocephalus#R. Individual variation considerable; mainland form sibiricus synonymized with nominate by some authors#R, and species sometimes treated as monotypic. Identity of proposed form nisoides has caused considerable confusion: this name has commonly been used (tentatively) for populations of A. virgatus breeding in Myanmar, Andaman Is and some other parts of SE Asia#R; described by Blyth in 1847, with type locality Malacca, the type specimen (female) is now thought to be lost; in 1866, Blyth himself withdrew his name nisoides, stating that, after access to previously unavailable literature, he now realized that his bird was identical to A. gularis, which is a migrant in those areas; however, due to the original mistake, and some confusion referring to the dating of the name gularis, name nisoides continued to appear in the literature, with some spurious population assignations based solely on males (male was unknown in original description); after lumping of A. gularis and A. virgatus, name became more commonly repeated as A. virgatus nisoides, and when A. gularis was resplit many authors retained nisoides as a supposed form of A.virgatus; despite all this confusion, it now appears clear that nisoides is nothing more than a junior synonym of gularis#R. Three subspecies normally accepted.
Food and feeding
Status and conservation
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