Rattus rattus, commonly known as the black rat or ship rat, is a species of rodent belonging to the family Muridae. It is characterized by its slender body, long tail, and large ears. This species is typically found in warm climates and is known for its adaptability to various environments, including urban areas. Originally native to Southeast Asia, Rattus rattus has spread globally, often associated with human activity. It is known for its role in the spread of diseases, such as the bubonic plague, and can be a pest in homes and agricultural settings.