Raza Island, Gulf of California.
Sometimes placed in Brachyramphus or in Endomychura. May be conspecific with S. hypoleucus, but no evidence of hybridization in zone of possible overlap (San Benito Is), and recent work shows them to be genetically distinct#R. Monotypic.
Numerous islands in Gulf of California (N to San Jorge), and islands along Pacific coast of Baja California (Cedros, Asunción–San Roque, and possibly San Martín and San Benito)#R. Winters at sea in Gulf of California and along coasts N to S California (Monterey Bay) and S to W Mexico (Nayarit).
Food and feeding
Status and conservation
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