Wyoming's Bighorn Mountains: Why Fir Trees Form Dense Island Clusters

High in Wyoming's Bighorn Mountains, fir trees do not spread themselves evenly across the land — they gather, as living things often do, where conditions conspire in their favor. Ecologists have come to understand that these dense island clusters are not accidents of terrain but the result of interlocking forces: wind shelter, snow accumulation, moisture retention, and soil depth converging in specific places. In learning why these forests grow where they do, we gain a clearer sense of how fragile and precise the conditions for life can be — and how much depends on protecting the particular co