The Ring - billed Gull is a medium sized bird. Adults are 49 cm (19 in) length and with a 124 cm (49 in) wingspan. The head, neck and underparts are white; the relatively short bill is yellow with a dark ring; the back and wings are silver gray; and the legs are yellow. The eyes are yellow with red rims. This gull takes three years to reach its breeding plumage; its appearance changes with each fall moult.
Habitat and Distribution
Their breeding habitat is near lakes, rivers or the coast in Canada and the northern United States. They are migratory and most move south to the Gulf of Mexico and the Atlantic and Pacific coasts of North America, also the Great Lakes. This gull is a regular wanderer to western Europe. In Ireland and Great Britain it is no longer classed as a rarity, with several birds regularly wintering in these countries.
These birds forage in flight or pick up objects while swimming, walking or wading. They also steal food from other birds. The diet may include insects, fish, grain, eggs, earthworms and rodents.
The Ring - billed Gull nest colonially on the ground, often on islands. This bird tends to be faithful to its nesting site, if not its mate, from year to year