The ashy storm-petrel can only be found on the islands off California and in the adjacent waters. This species' limited year-round range extends from Cape Mendocino, California, to northern Baja, just south of the US- Mexico border. Breeding colonies occur on offshore islands in the area, including the Southeast Farallon islands, San Miguel, Santa Barbara, Santa Cruz, Anacapa, San Clemente and Mexico's Coronados islands. On most of the larger islands listed above, breeding occurs on outlying rock formations, free of mammalian predators.
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