Many paired couples; some mating
The Western Gull, Larus occidentalis, is a large white-headed gull that lives on the western coast of North America. It was previously considered conspecific with the Yellow-footed Gull (Larus livens) of the Gulf of California. The Western Gull ranges from Washington and British Columbia to Baja California, and because of its convenient colonies on the coast of California it is well studied. Despite being a well-known bird species on the West Coast of the US, it...
