Norway rats eat a wide variety of foods but mostly prefer cereal grains, meats, fish, nuts, and some fruits.
When Norway rats invade buildings, they usually remain in the basement or ground floor. They also live in fields, farms, woodpiles and buildings. Their nests are usually lined with shredded paper or cloth.
These rats are known for the damage they cause by chewing on materials, urinating on food and eating stored foods. They have also been known to chew on wires, which can cause fires to start. They also carry disease and ectoparasites. Rats will also attack both animals and humans. Human babies and even adults have been killed in rat attacks.