Canadian Rockies

Rewilding the shortgrass prairie

 Rewilding the shortgrass prairie

Before European settlers came to North America, bison migrations were essential to the annual renewal of shortgrass prairie ecosystems, says EarthWatch chief scientist Cristina Eisenberg. By nipping off grasses, fixing nitrogen in the soil, and churning up the earth, their passage kept grasslands across parts of Montana, Wyoming, Colorado and Idaho functioning smoothly.