Races diadematus and bimaculatus have been proposed as one or two separate species, with nigrimentum perhaps a third species; although these three taxa appear to constitute a weakly defined group, based on the shorter tail, rather narrow black forehead, slightly darker grey upperparts and less extensive white on distal outer rectrices (not just a function of tail length), vocal differences among them seem pronounced#R; moreover, all Australian populations have a song not shared with any taxa in rest of species’ range; detailed research needed on plumage, morphometric and vocal characters for a robust reassessment of species limits (especially given tentative molecular findings that S populations of the species may be closer to S. guttula than to N populations#R). Birds of Morotai, formerly separated as race morotensis, included here within bimaculatus; birds from Gorong (off E Seram) described as race wellsi, but considered indistinguishable from nigrimentum. Form bernsteinii, listed in HBW for Salawati, now considered invalid, being based on an erroneously labelled specimen (probably from Ambon) of nigrimentum#R. Eight subspecies recognized.
Food and feeding
Status and conservation
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