Rattus norvegicus, commonly known as the brown rat or Norway rat, is a species of rodent that is widely distributed around the world. It typically has a robust body, a long tail, and small ears. These rats are highly adaptable and can thrive in various environments, including urban areas, farms, and forests. They are primarily nocturnal and are known for their strong social structures. Brown rats are omnivorous, feeding on a variety of foods, including grains, fruits, and even small animals. They are known for their intelligence and problem-solving abilities, which help them navigate their surroundings and find food. Rattus norvegicus plays a significant role in ecosystems but can also be a pest in human habitats.