$Procellaria aequinoctialis perspicillata Jouanin & Mougin,1979,Mayr & Cottrell(eds.),Checklist of Birds of the World,2nd edn,1,p.86.
Marine & pelagic.preferring offshore waters over continental shelf.Breeds on oceanic islands,occupying hills or slopes,preferably forested
Migrates up east Pacific to wintering areas off west coast of North America,some reaching Gulf of Alaska.Returns by the same route. Recorded northwest to Hawaii and Line Islands,and southwest to southeast Australia and New Zealand.