They are the fastest land mammals in North America, clocked at speeds of up to sixty miles per hour. Of all the world's land animals, only cheetahs are faster. When a herd of these animals passes at a run, their pounding hoofs sound like a fire raging across the prairie. These powerful, fast-running creatures are American pronghorn antelope, whose populations are found in southwestern Canada, throughout much of the United States, and in northern Mexico. This captivating book follows a herd of Wyoming pronghorn from the sagebrush desert in the spring, to the mountainous high country in summer, and, finally, to lower elevations where the herd returns for winter. The animals follow an ancient cycle. The Wyoming herd has traveled this migration route since the last Ice Age. With a simple, lyrical text, and stunning full-color photographs, this beautiful book offers a fascinating look at the life and behavior of an extraordinary animal.