United States. National Park Service

“ A wide diversity of weather conditions, soil, and elevation, and the location of the monument between the mountains and plains, produce an interesting and extensive fauna and flora. These factors, together with interesting geological problems, afford the student of natural history a wealth of observation and information if he will but take the time to follow not only the trail which encircles the Devils Tower proper but the 41⁄2 miles of nature trail as well. ”

“ Their presence in towns covering several square miles was incompatible with agriculture, and the elimination of the species has progressed to the point where they are now rarely found. Since all forms of plant and animal life are protected within national monuments, this colony of prairie dogs gives one a glimpse of the Old West. ”

“ The Tower rises to a height of 1,280 feet from the river bed and some 865 feet from its apparent base on the hilltop. The diameter at its base is approximately 1,000 feet, and at the top averages 275 feet. The top surface embraces about an acre and a half, upon which mosses, ferns, grasses, shrubs, and sagebrush grow. Mice, pack rats, and chipmunks have been seen there, and the falcon and hawk make it their home. As viewed from various angles, the Tower has many shapes.
The fresh rock is of a dark grey color which, after weathering, bleaches to a light grey with tinges of buff. ”