Eastern Central Pacific (B) (NB), Mexico (B) (NB), USA (B) (NB).
Unknown to Ecuador.
Bird I, Farallon Is and Channel Is, off California (USA), south to Coronados Is (Mexico).
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is 5,200 - 10,000 (2010) and decreasing.
Status EN
Pollution of forgaing areas, predation by introduced mammals, Western Gull (Larus occidentalis) and Barn Owl (Tyto alba), disturbance from human activity are the main threats.
For more information see BirdLife International Species Factsheet.
Food
Planktonic crustaceans, small fish. Aggregations coinciding spatially and seasonally with the spawning aggregations of sardines and anchovies.
Similar Species
Very similar to Black Storm-Petrel (Hydrobates melania) but paler, smaller and with a relatively longer tail that is held upswept in flight.
References
See References.
BirdLife International Species Factsheet