Often included in P. externa. Has been considered a subspecies of P. hasitata. Taxon occulta (“Vanuatu Petrel”) was established for a population previously included in P. externa, and later referred to P. cervicalis, to which it appears closely related on basis of molecular data. No comparison of vocalizations of this form with those of latter from Macauley (in Kermadec Is) yet published. Some authors declined to recognize occulta as a full species#R, and others, having observed birds at sea and examined museum specimens, concluded that “overall, Vanuatu Petrel is only slightly smaller” and that underwing pattern shows “significant overlap”, and hence “we prefer to complete our own genetic and acoustic work on this matter before commenting on the taxonomy of the Vanuatu Petrel”#R. Meanwhile (and to date), the differences in total appear to be: smaller size including smaller eggs (1); proportionately longer tail (1); greyer underwing (1); dark outer tail (1); earlier breeding period, albeit by only 6 weeks#R (ns). Two subspecies recognized.
Food and feeding
Status and conservation
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