Marine Birds
Seabirds do not comprise a taxonomic or evolutionary group of birds, they are simply defined as birds that spend most of their life feeding and living on the open ocean, coming to land only to breed. The Gulf of Farallones’s productive waters make it home to the largest concentration of breeding seabirds in the continental U.S. This includes resident species that nest on the Farallon Islands as well as highly migratory and vagabond pelagic birds. The Farallon Islands host close to 400,000 breeding seabirds as well as 15 species of breeding seabirds. In the spring, dense colonies of cormorants, auklets, common murres and western gulls nest on the islands' rocky slopes and underground burrows.

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