Guide to North American Birds

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Photo: A. Binns/Vireo

Western Gull

Larus occidentalis

The only gull nesting along most of the Pacific Coast from Washington to Baja, this large species is common at all seasons. An opportunist, it often nests around colonies of other seabirds, where it can steal unguarded eggs or chicks. It will also nest near colonies of California sea lions, scavenging any sea lion pups that die of natural causes. At the northern end of its range it hybridizes with Glaucous-winged Gull, and many intermediate birds are seen.

Conservation status	Common, and numbers apparently stable. Nesting at some colonies has been impacted in the past by effects of pesticides in the food chain.
Family	Gulls and Terns
Habitat	Coastal waters, estuaries, beaches, city waterfronts. Mostly along immediate coast, but regularly found well out at sea, especially between coast and nesting islands. Visits garbage dumps, ponds, and flat open areas (such as parking lots) within a few miles of coast, but almost never found farther inland. Nests on islands and locally on mainland cliffs.

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Feeding Behavior

forages while walking or swimming, or may plunge into water from flight. May drop hard-shelled clams and crabs onto rocks while in flight to break them open.

Eggs

Usually 3, sometimes 1-5, rarely 6. Clutches of more than 3 eggs result from 2 females laying in same nest, which happens fairly often at some colonies. Eggs buff to olive or gray, blotched with darker brown. Incubation at normal nests is by both parents (female may do more), 25-29 days. In very hot weather, adults may fly to water and soak belly feathers to cool eggs. Young: Fed by both parents. May leave nest when a few days old and hide in nearby vegetation. Capable of flight at about 6-7 weeks after hatching. Young depart from some colonies at about 10 weeks, becoming independent then; at other colonies, young may be fed by parents longer.

Young

Fed by both parents. May leave nest when a few days old and hide in nearby vegetation. Capable of flight at about 6-7 weeks after hatching. Young depart from some colonies at about 10 weeks, becoming independent then; at other colonies, young may be fed by parents longer.

Diet

Fish and other marine life, eggs, carrion, refuse. Feeds on a wide variety of aquatic life, including fish, crabs, squid, clams, sea urchins. Eats eggs and young (and sometimes adults) of other birds. Around sea lion colonies, scavenges dead pups and afterbirth. Also eats other carrion, and scavenges in dumps and around docks for refuse.

Nesting

First breeds at 4 years or older. Nests in colonies. Nest site is on ground or on cliff ledge, sometimes on boat or building, sometimes under overhanging rock. Nest (probably built by both sexes) is shallow depression, usually with lining of grass, other plants.

Illustration © David Allen Sibley.
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Text © Kenn Kaufman, adapted from
Lives of North American Birds

Migration

Present all year throughout its breeding range, but banding records show that individuals wander widely within this range. Some move north into British Columbia and south to southern Baja, especially in winter. Almost never found inland.

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Migration

All Seasons - Common
All Seasons - Uncommon
Breeding - Common
Breeding - Uncommon
Winter - Common
Winter - Uncommon
Migration - Common
Migration - Uncommon

Songs and Calls

Squeals and raucous notes.

Audio © Lang Elliott, Bob McGuire, Kevin Colver, Martyn Stewart and others.
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How climate change could affect this bird's range

In the broadest and most detailed study of its kind, Audubon scientists have used hundreds of thousands of citizen-science observations and sophisticated climate models to predict how birds in the U.S. and Canada will react to climate change.

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