Marine & highly pelagic,rarely approaching land except at colonies.Breeds on volcanic islands,occupying hills & slopes usually with dense covering of trees and shrubs, at altitude of 200-200m,up to 12 km inland.
"Laying dates dispersed throughout the year." (HBW,1,p.238)
Probably disperses in tropical and subtropical waters of Pacific Ocean. Some birds occur off Northeast Australia and New Guinea. Also recorded off Taiwan and in Eastern Pacific,off Mexico & Peru.