California Gull (Larus californicus) [XC189395]
by Andrew Spencer from Lake Mason, Lake Mason NWR, Musselshell Co., Montana, United States (call)
California Gull (Larus californicus) [XC488170]
by Andrew Spencer from J Street Marina, Chula Vista, San Diego Co, California, United States (call, flight call)
Subspecies
Fossil from late Pleistocene of Oregon. The subspecies, formerly disjunct, have recently come together in northern plains, where a zone of secondary contact is forming. Genetic studies have shown little divergence between them.
The following 2 subspecies are recognised:
albertaensis Jehl, 1987 - Southern Mackenzie (Great Slake L), Alberta and western Manitoba to South Dakota.
californicus Lawrence, 1854 - Eastern Washington and Great Basin to central Montana and Wyoming.