Mus musculus, commonly known as the house mouse, is a small rodent belonging to the family Muridae. It typically measures about 6 to 10 centimeters in body length, with a tail that can be as long as its body. House mice are found in a variety of habitats, including urban areas, fields, and forests, and are known for their adaptability and ability to thrive in close proximity to humans. These mice are primarily nocturnal and are omnivorous, feeding on seeds, fruits, and small insects. Mus musculus plays a significant role in scientific research, particularly in genetics and medicine, making it one of the most studied mammals in laboratories worldwide.