This storm petrel feeds at sea from breeding sites off Mexico. GPS-tracked breeding birds used waters from central Baja California to southern California in the eastern North Pacific.
It is dark overall, with a white rump crossed by a black band and a deeply forked tail.
At breeding sites it nests in rock crevices or shallow burrows near the sea. Breeding birds forage offshore; GPS tracking recorded use of a broad area of the eastern North Pacific.
An extinction-risk assessment has not been added yet.