Known to have hybridized with S. dactylatra, juvenile of which closely resembles present species. Has been suggested that form brewsteri may be a separate species (with etesiaca as a race)#R#R. Birds breeding on Clipperton I and in Tres Marías Is (off W Mexico) sometimes recognized as race nesiotes, but considered inseparable from brewsteri; rogersi (from Western Australia) synonymized with plotus. Four subspecies recognized.
Food and feeding
Status and conservation
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