Site is on ground or cliff of island, or on low trees such as mangroves. White, becoming nest-stained. Incubation by both sexes, roughly 28-30 days. Young may leave ground nests after about 5 weeks and gather in groups, where returning parents apparently can recognize own offspring. Age at first flight varies, reportedly 9-12 weeks or more.
Adults continue to feed young for some time after they leave colony.
1 brood per year. Conservation Declined drastically in mid-20th century, as pesticides caused eggshell thinning and failure of breeding.