Closely related to A. jobiensis, A. kubaryi and A. erythropterus; this group also has somewhat more distant affinities with A. sanctaecrucis, A. stairi and †A. salamonis. In the past, A. kubaryi was listed as a race of present species. Monotypic.
Northern Mariana Is on Asuncion, Pagan, Alamagan, Saipan, Tinian, Agiguan and Rota (probably extirpated from Guam#R); also Yap I, in Caroline Is.
Food and feeding
Status and conservation
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