Herring Gull

The Herring Gull is a widespread, adaptable large gull of Europe, breeding along coastlines, on inland lakes, and increasingly in urban areas, where it has become a familiar and sometimes bold scavenger. Adults show classic 'gray-backed' gull plumage with pale gray mantle feathers, a white head and body, and black wingtips marked with white spots known as mirrors, while immature birds pass through several years of mottled brown plumages before reaching maturity.

Adult mantle and back feathers are a medium pale gray, plain and unmarked, contrasting with crisp white head, neck, and underparts feathers. The outer primary flight feathers are black with white tips and one or two white spots (mirrors) near the tip, a key feature for aging and identification. Immature birds show heavily mottled brown-and-buff feathers overall in their first year, gradually transitioning through gray-brown intermediate plumages over three to four years before reaching adult gray-and-white pattern. Tail feathers in immature birds show a dark brown terminal band, becoming pure white in adults. Leg color, though not a feather feature, is pink in adults, useful in combination with feather pattern for species confirmation.

Sexes look alike in plumage, though males average slightly larger. This is a four-year gull, meaning it takes about four years to reach full adult plumage, passing through a series of increasingly gray and less mottled immature plumages each year. Winter (nonbreeding) adults show light brownish streaking on the head and neck, absent in breeding adults which have a clean white head. Molt is extensive and complex, with a partial pre-breeding molt of head and body feathers and a complete post-breeding molt including flight feathers.

Breeds along coastlines, cliffs, and increasingly on rooftops in towns and cities across northern and western Europe, as well as around inland lakes and rivers in some regions. Highly adaptable, it forages in coastal waters, harbors, landfills, agricultural fields, and urban areas, with many populations resident or only short-distance migrants, though northern populations may move further south in winter.

Herring Gulls are opportunistic foragers, taking fish, invertebrates, carrion, and human food waste, often foraging at landfills, harbors, and urban areas as well as natural coastal habitats. Nests are built on cliff ledges, rooftops, or ground sites, often in loose colonies, with both parents incubating and feeding chicks. The call is a loud, wailing series of notes, the classic 'seagull cry' familiar from coastal recordings. Some regional populations have declined due to changes in fishing practices and food availability.