Western Diamond Back

Range and habitat
Western diamondback rattlesnake (Crotalus atrox), responsible for the majority of venomous snakebites in North America, coiled in defensive posture with rattle erect

Rattlesnakes are native to the Americas, living in diverse habitats from Southwestern Canada to Central Argentina. The large majority of species live in the American Southwest and Mexico. Four species may be found east of the Mississippi river, and two in South America. In the United States, the state with the most forms of rattlesnakes is Arizona, with seventeen species and subspecies.