Western Gull (Larus occidentalis) [XC435662]
by Paul Marvin from Morro Bay, Morro Strand State Beach, San Luis Obispo County, California, United States (call)
Western Gull (Larus occidentalis) [XC21304]
by Paul Marvin from Adolfo L\u00f3pez Mateos, Comond\u00fa Municipality, Baja California Sur, Mexico (call)
Subspecies
Interbreeds freely with Glaucous-winged Gull (Larus glaucescens) at northern end of range.
The following 2 subspecies are recognised:
occidentalis Audubon, 1839 - North-western Washington (Destruction I) to central California (Farallon Is).
wymani Dickey & van Rossem, 1925 - Central California (Monterey Bay) to central Baja California (Guadalupe I).