Current status:

California Species of Special Concern, candidate for federal ESA listing


Islands along coastal California and NW Mexico.  Half the world’s population (4,000- 9,000) breeds on the Farallon Islands

Causes of decline:

Predation on adults while at breeding colonies, climate change impacts to ocean food web, ocean pollution, invasive species on islands, human disturbance at sea and on islands

Current primary threats:

On the Farallon Islands, predation by burrowing owls to adults is resulting in significant impacts on the growth rate of this population;  Burrowing Owls presence on the Farallones is enhanced by the presence of non-native house mice

What we’re doing about it:

The U.S. Fish and Wildlife Service, Point Blue Conservation Science, and Island Conservation are partnering together to investigate ways to strengthen Ashy-Storm Petrel and other native seabird populations on the islands by removing invasive house mice.  If invasive species are removed from islands, island ecosystems can often recover quickly and be more resilient to increasing climate change impacts.

Learn more:

Visit the Restore the Farallones website

1999 Report to the United States Geological Survey- Biological Resources Division. Population Status, Prospects, and Risks Faced By Two Seabirds of The California Current: The Ashy Storm-Petrel, Oceanodroma Homochroa, and Xantus' Murrelet Synthliboramphus Hypoleucus. 


How you can help:

Download, use and share our Seabird Aware brochure

Learn more at the Restore the Farallones website.