Superficially similar to geographically remote A. insignis, but differs in its milky-brown vs blackish hood (3), metallic grey vs blackish wings (2) and short white uppertail-coverts (in insignis these coverts are long and cover far more of the tail: 2). Birds of Sula Is previously separated as race sulaensis, but insufficiently distinct, merely averaging slightly smaller#R. Monotypic.
Food and feeding
Status and conservation
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