Western Gull (Larus occidentalis) [XC153723]
by Nick Komar from J Street Marina, Chula Vista, San Diego Co, California, United States (call)
Western Gull (Larus occidentalis) [XC620780]
by Richard E. Webster from Glorietta Bay Park, Coronado, San Diego County, California, United States (flight 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).