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BiologyIn contrast with the long-distance migratory habits of most other storm petrel species, ashy storm-petrels typically remain within the vicinity of the breeding colonies year round (3) (6). The breeding season by comparison with other species is also unusually protracted and asynchronous, occurring from February through to October, with some chicks fledging while others are barely hatching (2) (3). The basic nests, which comprise little, if any, supplementary bedding, are made in cavities within rock crevices (3) (6). A single egg is incubated by both parents for approximately 45 days before hatching. Under the cover and relative safety of night, the adults journey to and from the nest on foraging bouts (3). Small fish, squid and crustaceans form the bulk of the ashy storm-petrel's diet. It feeds either by resting on the surface and tearing flesh from larger prey or by hovering near the surface and using its bill to catch smaller prey such as crustaceans. The growing chicks are fed regurgitated food by the parents and will eventually fledge after around 84 days (2) (3).