<P> 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 . However, rattlesnakes fall prey to hawks, weasels, king snakes, and a variety of other species . Rattlesnakes are heavily preyed upon as neonates, while they are still weak and immature . Large numbers of rattlesnakes are killed by humans . Rattlesnake populations in many areas are severely threatened by habitat destruction, poaching, and extermination campaigns . </P> <P> Rattlesnakes are the leading contributor to snakebite injuries in North America . However, rattlesnakes rarely bite unless provoked or threatened; if treated promptly, the bites are seldom fatal . </P> <P> Rattlesnakes are native to the Americas, living in diverse habitats from southwestern Canada to central Argentina . The large majority of species lives 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 states with the most types of rattlesnakes are Texas and Arizona . </P> <P> Rattlesnakes are found in almost every type of habitat capable of supporting terrestrial ectothermic vertebrates, but individual species can have extremely specific habitat requirements, only able to live within certain plant associations in a narrow range of altitudes . Most species live near open, rocky areas . Rocks offer them cover from predators, plentiful prey (e.g. rodents, lizards, insects, etc. that live amidst the rocks), and open basking areas . However, rattlesnakes can also be found in a wide variety of other habitats including prairies, marshes, deserts, and forests . Rattlesnakes prefer a temperature range between 80 and 90 ° F (26 and 32 ° C), but can survive temperatures below freezing, recovering from brief exposure to temperatures as low as 4 ° F (− 16 ° C), and surviving for several days in temperatures as low as 37 ° F (3 ° C). </P>

Where are the most rattlesnakes in the us
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