Has been considered closely related to A. sawtelli, or even to be conspecific with it, but apparently differs in nest habits. Race ocistus (with gilliardi) sometimes considered a distinct species, being intermediate in some features between nominate race and A. sawtelli; case rests on these taxa having slightly shorter wings (1), deeper tail fork (2) and “dusky-brown” vs “fuscous” back (1), but ocistus has feathered tarsi while gilliardi and leucophaeus have bare tarsi#R. Variation in relative pallor of rump within birds of Tahitian population led to past recognition of pale-rumped race “thespesius”, but this now considered to fall within normal range of variation of nominate. Three subspecies currently recognized.
Food and feeding
Status and conservation
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