Hitherto considered conspecific with B. fistulator, but separated on account of outer tail feathers all white vs black with broad white tips (2); inner primaries and all secondaries all white vs all black (3); bill mainly cream vs mainly dusky brown (2); periorbital skin black vs dark blue#R (ns ); larger size (although duboisi seemingly as large again as sharpii is over fistulator) (1 or 2); narrow zone of intergradation along R Niger (2), although birds showing some characters of B. sharpii have been claimed as far W as Ghana#R. Two subspecies recognized.
Food and feeding
Status and conservation
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