Discover the fascinating world of the Peninsular Pocket Mouse (*Chaetodipus penicillatus*), an endangered species native to the arid Baja California Peninsula. Known for its distinct fur-lined cheek pouches and nocturnal behaviors, this small rodent plays a vital role in its ecosystem as a seed disperser while facing threats from habitat loss. Explore its unique adaptations and the importance of conservation efforts to protect this charming creature.