- 19.7–23.2 in
- 47.2–56.3 in
- 31.7–42.3 oz
- Goéland à ailes grises (French)
- Gaviota de alas glaucas (Spanish)
- The Glaucous-winged Gull takes a variety of food, including live animals in addition to carrion and garbage. It has been known to kill and eat rabbits and pigeons, as well as Glaucous-winged Gull chicks. Older birds are more efficient at finding food than younger birds.
- The Glaucous-winged Gull hybridizes extensively with the Western Gull, with the hybrids being the most common form in Washington. The hybrids can be similar to the parent adult forms, but usually have intermediate back and wingtip coloring. With the medium-gray back, dark upper surface to wingtips, frosty white undersurface to wingtips, and a darkish eye, a hybrid may closely resemble a robust Thayer's Gull. The flatter and larger head of the hybrid, and especially the thick bill with a pronounced angle on the bottom, should help distinguish it from the smaller, slimmer Thayer's Gull.
- The Glaucous-winged Gull nests on roofs of buildings in some areas. They prefer to nest on flat roofs, but will nest on peaked roofs in flat areas near chimneys or other structures.
- The oldest recorded Glaucous-winged Gull was at least 23 years, 10 months old. It was banded in British Columbia in 1977, and found in Washington in 2001.
Breeds on rocky islands and coastal cliffs, sometimes on flat roofs of buildings. Forages at sea, in intertidal areas, along beaches, and at dumps. Roosts in fields, dumps, and parking lots.
Marine invertebrates and fishes. Eggs and chicks of seabirds. Scavenges carrion and refuse.
- Clutch Size
- 1–4 eggs
- Egg Description
- Light greenish marked with dark scrawls.
- Condition at Hatching
- Chicks semiprecocial at hatching; may leave nest cup at one day old. Covered in cryptically colored down.
Nest is a scrape in the ground filled with grass, weeds, moss, roots, dead twigs, string, bones, turf, and seaweed. Nests in colonies, often with other gull species.
Captures food near surface of water or on shore. Steals food from cormorants and other gulls. Swallows large prey whole. Common at garbage dumps.
Glaucous-winged Gull populations were stable between 1966 and 2014, according to the North American Breeding Bird Survey. The North American Waterbird Conservation Plan estimates a continental population of 380,000 breeding birds and rates the species a 10 out of 20 on the Continental Concern Score, listing them as a Species of Low Concern. Glaucous-winged Gull is not listed on the 2014 State of the Birds Report.
- Verbeek, N. A. M. 1993. Glaucous-winged Gull (Larus glaucescens). In The Birds of North America, No. 59 (A. Poole, and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia, PA, and The American Ornithologists' Union, Washington, D.C.
- Kushlan, J.A., et al. 2002. Waterbird conservation for the Americas: the North American Waterbird Conservation Plan, version 1. Waterbird Conservation for the Americas. Washington, DC.
- North American Bird Conservation Initiative, U.S. Committee. 2014. State of the Birds 2014 Report. U.S. Department of Interior, Washington, DC.
- Sibley, D. A. 2000. National Audubon Society: The Sibley Guide to Birds. A. A. Knopf, Inc., New York.
- USGS Patuxent Wildlife Research Center. 2015. Longevity records of North American Birds.
- USGS Patuxent Wildlife Research Center. 2014. North American Breeding Bird Survey 1966–2014 Analysis.