|Conservation status||Numbers probably stable, but overfishing and pollution of Gulf of California could have negative impact. Vulnerable to introduced predators (such as rats and cats) on some nesting islands.|
|Habitat||Open ocean. Favors warm waters; more likely to move north along California coast in years when water temperature is higher. Generally over continental shelf, and may occur closer to shore than some other storm-petrels, often being seen from shore in Mexico. Nests on rocky islands.|
forages mostly by fluttering low over water and taking items from surface. Seldom sits on water to feed.
One. White. Incubation probably by both sexes. Young: Probably both parents feed young.
Probably both parents feed young.
probably tiny crustaceans and other very small marine life. Diet very poorly known; presumably feeds mainly on zooplankton (general term for tiny creatures floating in water). Once reported to feed on larval stages of spiny lobster.
Nesting behavior poorly known. Breeds in colonies on islands off northwestern Mexico. At San Benito Island, many nests reported to have eggs during July. Active around nesting colonies only at night. Makes whirring calls from inside nest. Nest: Site is reported to be usually among piles of rocks, or in crevices in cliffs. Apparently not in burrows as in many other storm-petrels. Several pairs may nest close together if good sites are clustered. No nest built, egg laid on bare rock.
Text © Kenn Kaufman, adapted from
Lives of North American Birds
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Moves north irregularly into California waters, mostly August and September. Numbers quite variable; sometimes hundreds recorded, occasionally none. In mid-autumn moves south along coast of Central America, commonly as far as Panama, a few as far as Peru.
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Songs and CallsTwittering and squeaking notes at nesting colonies.
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