A Sidewinder rattlesnake -- also called the Horned Rattlesnake. The Sidewinder hides in desert sand or in animal burrows. It travels by throwing a loop of its body in the direction it wants to go, pulling the rest of its body to the loop, and repeating the process. Primarily nocturnal, the Sidewinder is rarely more than 30 inches long.

Photo courtesy of National Park Service, U.S. Department of the Interior.