Mammals of the Grand Mesa, Colorado

Perched thousands of feet above the Colorado valleys, the Grand Mesa rises like a green island in an arid sea. Its cool, moist forests provide a hidden refuge for a host of small mammals rarely seen elsewhere in the region. The landscape itself feels both remote and inviting, setting the stage for a detailed natural‑history survey.

In the summer of 1954 a team of University of Kansas naturalists trekked across this plateau, setting snap traps and live‑catch nets along winding ridges and alpine meadows. Their meticulous notes recorded everything from masked shrews and vagrant shrews to water shrews, revealing twenty‑two confirmed species and several more observed only fleetingly. The data show surprising patterns of abundance, age structure, and reproductive status, painting a vivid portrait of a thriving but understudied community.

Beyond the inventory, the study expands the known ranges of several subspecies, underscoring how isolated high‑elevation habitats can serve as crucial refuges for biodiversity. Listeners will gain a sense of the careful fieldwork that turns a barren summit into a living laboratory, and an appreciation for the quiet complexity of mammals that call the Grand Mesa home.