Discover the intriguing Tres Marías Gray Mouse Opossum (Tlacuatzin insularis), a small, nocturnal marsupial unique to the Tres Marías Islands of Mexico. With its agile movements, prehensile tail, and vital role in the ecosystem, this fascinating species highlights the importance of biodiversity and island adaptation. Explore its behaviors, habitat, and conservation status to understand the delicate balance of life in this isolated environment.