![]() In the United States, the state with the most types of rattlesnakes is Arizona, with 13. Four species may be found east of the Mississippi River, and two in South America. The large majority of species live in the American Southwest and Mexico. Rattlesnakes are native to the Americas from southern Canada to central Argentina, with the majority of species inhabiting arid regions. Western diamondback rattlesnake ( Crotalus atrox), responsible for the majority of venomous snakebites in North America, coiled in defensive posture with rattle erect The name Sistrurus is the Latinized form of the Greek word for "tail rattler" (Σείστρουρος, seistrouros) and shares its root with the ancient Egyptian musical instrument the sistrum, a type of rattle. ![]() The scientific name Crotalus is derived from the Greek κρόταλον, meaning " castanet". Rattlesnake populations in many areas are severely threatened by habitat destruction, poaching, and extermination campaigns. Large numbers of rattlesnakes are killed by humans. Rattlesnakes are heavily preyed upon as neonates, while they are still weak and immature. Rattlesnakes are preyed upon by hawks, weasels, king snakes, and a variety of other species. The largest rattlesnake, the eastern diamondback, can measure up to 8 ft (2.4 m) in length. The 36 known species of rattlesnakes have between 65 and 70 subspecies, all native to the Americas, ranging from British Columbia through Ontario in southern Canada, to central Argentina. Rattlesnakes are the leading contributor to snakebite injuries in North America, but rarely bite unless provoked or threatened if treated promptly, the bites are seldom fatal. Rattlesnakes receive their name from the rattle located at the end of their tails, which makes a loud rattling noise when vibrated that deters predators or serves as a warning to passers-by. ![]() Rattlesnakes are predators that live in a wide array of habitats, hunting small animals such as birds and rodents. Rattlesnakes are venomous snakes that form the genera Crotalus and Sistrurus of the subfamily Crotalinae (the pit vipers). The subfamily also includes many genera of pit vipers that are not rattlesnakes. ![]() For other uses, see Rattlesnake (disambiguation) and Rattler (disambiguation). ![]()
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