The Ring-billed Gull is a common sight in North America and is found in a variety of habitats, including coastal areas, lakes, and rivers. It is a migratory bird that breeds in Canada and the northern United States and winters along the southern coasts of the United States, Mexico, and Central America. During migration, this species can also be found in large numbers in inland areas such as garbage dumps, agricultural fields, and parking lots.

One of the distinguishing field marks of the Ring-billed Gull is its yellow bill with a black band around the tip. This feature is only present in adult birds, and it helps to distinguish this species from other gulls. Another distinguishing feature is the black band around its eyes, which becomes less prominent in the winter. In flight, the Ring-billed Gull displays a black band at the tips of its wings, which is visible against its otherwise gray wings.

Ring-billed Gulls are opportunistic feeders and will eat a variety of foods, including fish, insects, crustaceans, and garbage. They are also known to steal food from other birds and have been observed feeding on the eggs and chicks of other bird species. During the breeding season, Ring-billed Gulls nest in colonies, typically on islands or other remote areas near water. They build their nests on the ground and lay two to three eggs, which hatch after about 25 days.

Overall, the Ring-billed Gull is a common and adaptable species that is well-known throughout North America. Its distinctive yellow bill and black band make it easy to identify, and its opportunistic feeding habits and ability to thrive in a variety of habitats make it a successful species.