Hitherto considered conspecific with B. hydrocorax, but differs in its yellow vs red distal half of bill (3); differently coloured circumorbital skin (yellow and black vs yellow) (1); juvenile tail with black base vs with black central band (3); smaller size (at least 1). Race semigaleatus itself fairly distinct. Basilan birds described as race basilanicus, but appear inseparable from nominate mindanensis. Two subspecies recognized.
Food and feeding
Status and conservation
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