[6] The breeding habitat is near lakes, rivers, or the coast across most of Canada, and the northern United States.

The ring-billed gull is a familiar sight in North American parking lots, where it can regularly be found congregating in large numbers.

In Ireland and Great Britain it is no longer classed as a rarity, with multiple birds regularly wintering in those countries, though has become rarer again since about 2010.

[11] Ring-billed gulls forage in flight or pick up objects while swimming, walking or wading.

They are omnivorous; their diet may include insects, fish, grain, eggs, earthworms and rodents.

[12] These birds are opportunistic and have adapted well to taking food when discarded or even left unattended by people.