Ring-billed Gull

The Ring-billed Gull is one of the most familiar and widespread gulls of interior and coastal North America, often seen far from the ocean around lakes, rivers, parking lots, and fast-food areas. Smaller and more lightly built than Herring Gull, it shows a similar gray-and-white plumage pattern but reaches maturity faster, over about three years rather than four.

Adult mantle feathers are a clean, medium pale gray, slightly paler and less bulky than Herring Gull feathers, contrasting with white head, neck, and underparts. Outer primary feathers are black with white tips and typically a single white mirror near the tip, generally smaller and less extensive black wingtip pattern than in larger gull species. First-year birds show mottled brown-gray feathers with a checkered pattern on the back, distinct from the coarser, blotchier brown of first-year Herring Gull. Second-year birds show mostly gray back feathers with residual brown in the wings, reaching adult-like gray-and-white plumage by the third year. Tail feathers in immature birds show a solid dark brown band, becoming clean white in full adults.

Sexes look alike, with males averaging slightly larger. This is a three-year gull, reaching full adult plumage faster than the four-year cycle of Herring Gull. Nonbreeding adults show light brownish streaking on the head and nape, molting to a clean white head before the breeding season. A complete post-breeding molt replaces flight feathers, typically completed by early winter.

Breeds colonially on islands in lakes, rivers, and coastal areas across much of Canada and the northern United States. Highly adaptable outside the breeding season, it is found around inland lakes, rivers, agricultural fields, parking lots, landfills, and coastal areas across a broad wintering range extending through the United States, Mexico, and the Caribbean.

Ring-billed Gulls are opportunistic and highly adaptable foragers, taking fish, invertebrates, insects, and readily accepting human food scraps, often congregating in large numbers at parking lots, landfills, and picnic areas as well as natural foraging sites. Nests are built on the ground in colonies, often on islands to reduce predation risk, with both parents sharing incubation and chick-rearing duties. Its call is a series of nasal, high-pitched notes. Conservation status is IUCN Least Concern, and the species has increased significantly in many areas over recent decades.