Perognathus is a genus of small rodents commonly known as pocket mice. They are primarily found in North America, particularly in arid and semi-arid regions. These mice are characterized by their fur-lined cheek pouches, which they use to store food. Their diet mainly consists of seeds and insects, and they are known for their burrowing habits. Pocket mice are typically nocturnal, meaning they are most active at night. They have adapted to their environments with features like long hind legs for jumping and a keen sense of smell. Perognathus plays a significant role in the ecosystem by aiding in seed dispersal and serving as prey for various predators.