Rattlesnakes are a group of venomous mura snakes from the Crotalinae tribe. The characteristic of this snake is its tail, which consists of segments that can make a loud sound when vibrated. Rattlesnakes consist of two genera, namely Crotalus sp. and Sistrurus sp..The scientific name comes from the words Krotalon ("clinker" for the genus Crotalus and Seistro-uros (Seistro="rattling" and uros="tail") for the genus Sistrurus.All types of rattlesnakes only exist and can only be found in America.