The monument's sagebrush steppe landscape appears ideal habitat for rattlesnakes, but they are not found here. Why? We don't know. Prairie rattlesnakes inhabit other parts of Wyoming at elevations over 8500 feet, but usually are restricted to elevations less than 7,000 feet.
Did You Know?
Fossil Butte National Monument preserves only 1% of the Fossil Lake deposits, the smallest of three ancient lakes that make up the famous Green River Formation.