Crotalus Sistrutus, commonly known as rattlesnakes are venomous snakes that, have about thirty different species of rattlesnake and several subspecies. For the most part rattlesnakes are native to the Americas, found in the American southwest and Mexico. It is really important to understand and practice methods of prevention, and if bitten, treatment.
C.sistrutus

Rattlesnake have powerful venom that can kill if not treated on time. It is important to understand that rattlesnakes can strike faster than the human eye can fallow, and the range of attack is roughly two-thirds of its total length.

Their venom can also destroy tissue and degenerate organs, causing coagulopathy. If not treated on time, the bite can lead to the loss of limb or even death. However, if treated on time with anti-venom, the death rate may be reduced to less than 4%.

Literature Cited
Clark, Rulon W (2005). Social lives of Rattlesnakes. Natural History.
Bruce A. Young, Molly Phelan, Malinda Morain, Melissa Ommundsen, and Robert Kurt (2003). Venom injection by rattlesnakes. Canadian Journal of Zoology.  Word Count: 238