The deer mouse (Peromyscus maniculatus) is a small rodent commonly found in North America. It has a slender body, large ears, and a long tail, typically measuring about 7 to 10 inches in length, including the tail. Its fur is usually brown or gray, with a white underbelly, which helps it blend into its natural habitat of forests, grasslands, and deserts. Deer mice are primarily nocturnal and are known for their agility and ability to climb. They are omnivorous, feeding on seeds, fruits, insects, and other small food sources. These mice play a significant role in their ecosystem by dispersing seeds and serving as prey for various predators, including hawks and snakes.