Quoy and Gaimard, 1830,
Belongs to a group of dark-coloured, iridescent Asian and Australasian forms, including C. janthina, †C. versicolor, †C. jouyi and C. leucomela; C. pallidiceps may also be related. Two of the geographically extreme taxa, metallica of the Lesser Sundas and castaneiceps of Samoa, appear the most distinctive: metallica by its dull mid-grey not white or pale grey throat (but anthracina of Palawan is similar, so no score), and dull darkish-grey belly to vent (3), castaneiceps by its distinctly brownish crown (3), and slaty-grey underparts (2); vocal evidence in both cases is needed. Race castaneiceps has recently been proposed as a full species, on account both to plumage and voice#R. Validity of race †godmanae uncertain, as no specimen exists, the description being based on a painting. Proposed race mendeni (Taliabu, Sula Is) no longer regarded as valid. Eight extant subspecies recognized.
Food and feeding
Status and conservation
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