The Washington Gap Analysis Project created breeding bird maps only. The non-breeding birds (e.g., wintering, pelagic (coastal), and birds expanding their ranges) are represented only by NatureMapping sightings.
NatureMapping observations reported by townships throughout the year.
The Heermanís Gull can be found in winter along the coast of California but can be seen all year in western Mexico and along the outer coast of Baja. Common post-breeding visitor in Washington coastal waters and Strait of Juan de Fuca; rare into winter.Text edited by Gussie Litwer