Larus canus, commonly known as the Common Gull or Mew Gull, is native to the northern parts of Europe, Asia, and North America. The geographical distribution includes the northern Atlantic coasts, spanning from the British Isles and northern Europe across to central Asia. In North America, they are found primarily along the northern and western coasts, as well as in Alaska and parts of Canada.

Common Gulls typically inhabit coastal regions, lakeshores, and riverbanks. They are also found in urban areas and agricultural fields during non-breeding seasons. The climate in their native regions ranges from temperate to subarctic, with cold winters and mild summers.

Larus canus is an opportunistic feeder, thriving in diverse ecological niches. They feed on a variety of food sources including fish, insects, earthworms, and human refuse. Depending on the season and local availability, they may exhibit different feeding behaviors and habitat preferences. They play a significant role in controlling insect populations and recycling nutrients within their ecosystems.