Brown rats, also known as Norway rats, are the most prevalent type of rat in Massachusetts, particularly in urban and suburban areas. These rats are notorious for their ability to adapt to various environments, often nesting in sewers, basements, and other hidden places close to human activity. They typically live in burrows in the ground, allowing them to infest almost any property, but they are also strong climbers and swimmers. Rats are also willing to travel for over a mile just to reach a water source, posing a problem for entire communities at once.