Nominate aeruginosus usually treated as a race of C. variolosus but, based on evidence from Obi (where populations may be separable as obiensis), apparently shares vocalizations of heinrichi#R. Race heinrichi sometimes considered a colour morph of C. variolosus, but is smaller and shorter-winged than sympatric form of latter, with vocalizations recalling aeruginosus rather than variolosus; has been considered a separate species. Two subspecies recognized.
Food and feeding
Status and conservation
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