This gull is found on the West Coast of North America, in a more restricted range than that of most gulls. It is a marine gull, nesting on islands, including San Francisco’s Alcatraz Island. It is typically very aggressive at defending nesting territories and has been considered a nuisance because of this. Its varied diet includes fish, mollusks, seal and sea lion carcasses, and trash.
Collection of items swallowed and regurgitated by Western Gulls recovered on the (relatively remote) Farallon Islands off the coast of Northern California. From Los Farallones blog, photo by Scarlett Hutchin.