California Gull

Identification

The California gull is a medium-sized gull that falls between the larger herring gull and smaller ring-billed gull, though size overlap with both species can occur. Adults are distinctive with brown eyes, yellow legs, and a more rounded head shape compared to similar species. The body is mainly white with a grey back and upper wings, and the bill is yellow with a characteristic black ring and red spot near the tip. Black primaries with white tips complete the adult plumage pattern. Length ranges from 46 to 55 cm (18 to 22 inches), with a wingspan of 122–137 cm (48–54 inches). Immature birds display browner plumage overall, appearing similar to immature herring gulls but darker than immature ring-billed gulls.

Range & Habitat

Although named after California, this species is found annually across most of western North America, ranging from the Canadian prairie provinces in the northeast south through western Mexico. Breeding habitat consists of lakes and marshes in interior western North America, extending from the Northwest Territories, Canada, south to eastern California and Colorado. Two subspecies are recognized: the nominate form occurring from the Great Basin to central Montana and Wyoming, and the slightly larger, paler L. c. albertaensis with a more northerly distribution from Great Slave Lake onto the Great Plains of western Manitoba and South Dakota.

California gulls are migratory birds, with most populations moving to the Pacific coast during winter months, where they can be regularly observed in western California. Breeding birds nest in colonies, sometimes alongside other species, constructing shallow ground depressions lined with vegetation and feathers. Females typically lay 2 or 3 eggs, with both parents sharing chick-feeding duties.

Behaviour & Diet

California gulls are highly opportunistic and versatile foragers, capturing food in flight or picking up objects while swimming, walking, or wading. Their diet consists mainly of insects, fish, and the eggs and young of other birds, particularly ducklings. These adaptable birds frequently scavenge at garbage dumps, marinas, and docks, and often follow fishing boats and plows to catch insects stirred up by such activity. They are bold around human settlements, commonly begging for food at public beaches and parks, and have become notorious for stealing food from people at picnics and outdoor restaurants.

Beyond animal prey, California gulls also consume various vegetables and fruits, particularly cherries, which has led to their designation as crop pests in some regions. This dietary flexibility has enabled population expansion in new areas, particularly in California where large landfills and salt-production ponds now provide abundant food sources.

Best Time & Places to See It

Year-round observation opportunities exist in western California, especially during winter months when migratory populations arrive at the Pacific coast. Interior breeding colonies in lakes and marshes from the Northwest Territories south to eastern California and Colorado are best visited during the breeding season. Urban and semi-urban areas including marinas, docks, beaches, parks, and landfill regions offer reliable sightings, particularly in California where populations have undergone recent exponential growth. The South Bay area near San Francisco holds particularly large resident flocks. Salt-production ponds and levees in California's interior are also productive locations for observation.

Photography Tips

The California gull's distinctive field marks—brown eyes, yellow legs and bill with black ring and red spot—make it an identifiable subject even at moderate distances. Photograph birds in good light to capture the subtle grey tones of the back and upper wings against the white body. The rounded head shape and facial proportions are diagnostic, so aim for clear head profiles. Immature birds present a different challenge due to their browner overall appearance; study transitional plumage carefully to distinguish them from other gull species. Coastal and urban settings provide excellent opportunities to capture natural behaviour, including feeding interactions, social groupings, and the characteristic postures of foraging birds.