The islands of the Farallon National Wildlife Refuge host the largest seabird breeding colony in the United States outside of Alaska and Hawai`i. Twenty-five percent of California’s breeding seabirds, with more than 300,000 individuals of 13 species, can be found there. About fifty percent of the world’s population of the rare Ashy Storm-Petrels (listed as a Species of Management Concern by the U.S. Fish and Wildlife Service and Endangered by the International Union for Conservation of Nature) breed on the Farallon National Wildlife Refuge islands. Unfortunately, the presence of introduced, non-native house mice threatens this globally significant seabird colony.

The U.S. Fish and Wildlife Service and Point Blue Conservation Science have partnered together to restore native seabird populations on the islands, particularly the Ashy Storm-Petrel. Removing invasive house mice will provide safer breeding habitat for seabirds and other native animals. Once invasive species are removed from islands, island ecosystems can often recover quickly.

Two Minutes on Southeast Farallon Island from Abe Borker on Vimeo.

Header Image: Endangered Ashy Storm-petrel photo copyright Point Blue Conservation Science/Annie Schmidt; South Farallon Island photo copyright Island Conservation/Erik Oberg