This is a marine gull that breeds on both offshore islands and rocky cliffs along the Oregon Coast. It also uses structures for nesting and, occasionally, will nest on grass-covered headlands.
The Western gull's food comes from the marine environment, estuaries, and the immediate shoreline. It eats small fish, clams, mussels, bird eggs, the young of other birds nesting nearby, sea urchins, starfish, squid, crustaceans, marine worms, and carrion. it will scavenge garbage or waste from fishing boats as well.
It is present all year along the entire coast of Oregon.