I felt old as the Sangre de Cristo peaks above the town, ugly as an adobe wall, and mean as a prairie rattlesnake.

The prairie rattlesnake is South Dakota's only venomous snake.

He whipped around to see a small prairie rattlesnake winding its way under a moss-covered rock.

Crotalus viridis, a.k.a. the prairie rattlesnake, a venomous pitviper species native to the western United States, southwestern Canada, and northern Mexico.

It has also been isolated from the venom of North American prairie rattlesnake, Crotalus viridis viridis.

Visitors are advised to wear long pants and hiking boots in the area, due to the presence of prairie rattlesnakes.

Alberta is home to only one variety of venomous snake, the prairie rattlesnake.

Common names: Hopi rattlesnake, Arizona prairie rattlesnake, prairie rattlesnake.

It is also home to the prairie rattlesnake and one of few known localities of rattlesnakes in Saskatchewan.

Visitors are cautioned to be on the lookout for prairie rattlesnakes, which frequent the site.