Closely related to C. pectoralis, especially its race nigriscapularis. Race ruwenzorii often treated as a separate species (as in HBW), and guttifer and koesteri have likewise been proposed as two separate species, but the case for lumping is strong#R#R#R#R. Specimens in NHMUK, including the type of ruwenzorii plus poliocephalus, guttifer and koesteri, indicate that there is a N–S stepped cline in quantity of white on outer rectrices, from all white (poliocephalus) to white with small dark base (ruwenzorii) to half-dark/half-white or, in some cases, two-thirds dark/one-third white (guttifer and koesteri); moreover, the distinctiveness of vocalizations is weak#R. Population in Saudi Arabia possibly racially distinct; requires further study. Four subspecies currently recognized.
Food and feeding
Status and conservation
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