Discover the intriguing world of the Sierra Madre Forest Mouse (*Peromyscus somniculus*), a vulnerable species native to the dense forests of northeastern Mexico's Sierra Madre Oriental. Renowned for its agility and adaptability in arboreal environments, this nocturnal creature plays a critical role in seed dispersal and forest regeneration, while facing threats from habitat loss. Join us as we explore its unique behaviors, diet, and the urgent need for conservation efforts to protect this remarkable rodent and its ecosystem.