Common Gull

The Common Gull is a medium-sized, delicately proportioned gull widespread across northern Europe and Asia, with a related population in northwestern North America often referred to as Mew Gull. It shows the classic gray-backed gull pattern in miniature compared to larger species, with a rounder head, smaller bill, and gentler expression, breeding both along coasts and well inland around lakes and tundra pools.

Adult mantle feathers are pale to medium gray, similar in tone to Ring-billed Gull, contrasting with white head and underparts. Outer primary feathers are black with white tips and typically large white mirrors near the tip, proportionately bold on this smaller species. Immature birds show mottled gray-brown feathers, finer and less coarse than in larger gull species, transitioning over about two to three years to full adult plumage, faster than the larger four-year gulls. The bill is notably slim and unmarked yellow-green in adults, without the black ring of Ring-billed Gull, a helpful supplementary feature alongside feather pattern.

Sexes look alike, with males averaging slightly larger. This species reaches adult plumage in about two to three years, more quickly than the larger four-year gulls, with immature plumages showing a relatively fine, evenly mottled gray-brown pattern rather than blotchy coarse markings. Nonbreeding adults show light brownish streaking on the head and nape, molting to a clean white head for breeding. A complete post-breeding molt replaces flight feathers, typically completed by early winter.

Breeds across a broad range of northern Europe and Asia, using coastal areas, inland lakes, rivers, bogs, and tundra pools, with a separate population in northwestern North America and eastern Siberia sometimes treated as Mew Gull. Many populations are migratory, moving to milder coastal areas, estuaries, and agricultural fields for winter, though some populations in maritime climates are more sedentary.

Common Gulls forage on a variety of food including fish, invertebrates, insects, and agricultural pest species, often foraging on freshly plowed or grazed fields as well as coastal and lake habitats. Nests are built on the ground near water, on cliff ledges, or occasionally in trees on old nests of other birds, with both parents sharing incubation and chick-rearing. Its call is a higher-pitched, more mewing series of notes than larger gulls, giving rise to the alternate name Mew Gull. Conservation status is IUCN Least Concern.