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The skin of rattlesnakes is intricately patterned in a manner that camouflages them from their predators. [62] [63] Rattlesnakes do not generally have bright or showy colors (reds, yellows, blues, etc.), instead relying on subtle earth tones that resemble the surrounding environment. [64] Cornett, James W. (1998). Rattlesnakes: Answers to Frequent Questions. Palm Springs, California: Nature Trails Press. ISBN 0-937794-23-6.

Keeping the cold out in the winter months is a must for everyone. Draughty leaks let cold air in, increase your electricity bills and make for a very cold night in. But what happens when your letter box lets the draft in and you are unable to seal it? The postman would find it difficult to deliver your mail.a b Graham, Karen S. (2001). "Rattlesnake". In Bell, Catharine E. (ed.). Encyclopedia of the world's zoos, Volume 3. Taylor & Francis. p.1040. ISBN 978-1-57958-174-9. a b c d e Cetaruk, Edward W. (2005). "Rattlesnakes and Other Crotalids". In Brent, Jeffrey (ed.). Critical care toxicology: diagnosis and management of the critically poisoned patient. Elsevier Health Sciences. p.1075. ISBN 978-0-8151-4387-1. Rattlesnake fangs are connected by venom ducts to large venom glands near the outer edge of the upper jaw, towards the rear of the head. When the rattlesnake bites, muscles on the sides of the venom glands contract to squeeze the venom through the ducts and into the fangs. When the fangs are not in use, they remain folded against the palate. [37] [38]

In 2016, Allf et al published a paper proposing behavioral plasticity as the mechanism by which the rattling system evolved in rattlesnakes. [51] [52] [53] In the case of rattlesnakes, Allf et al proposed that tail vibration in response to predator threat could be the precursor for the rattling system in rattlesnakes, an example of behavioral plasticity. [51] To investigate this hypothesis, the researchers analyzed tail vibration and relatedness to rattlesnakes among snakes in the families Viperidae and Colubridae. Their results demonstrated that the more closely related a species was to rattlesnakes, the more similar that species was to rattlesnakes in both duration and rate of tail vibration. [51] These results strongly support the hypothesis that tail vibration preceded the rattling system as a behavior and allowed for the rattle to be selected for once developed. Even a small, underdeveloped rattle early in the evolution of the rattling system could have been advantageous if tail vibration was an ancestral behavior. [54] Adams, Clark E. & Thomas, John K. (2008). Texas Rattlesnake Roundups. Texas A&M University Press. p.23. ISBN 978-1-60344-035-6.Aztec paintings, Central American temples, and the great burial mounds in the Southern United States are frequently adorned with depictions of rattlesnakes, often within the symbols and emblems of the most powerful deities. [99] Rattlesnakes are native to the Americas from southern Canada to central Argentina, with the majority of species inhabiting arid regions. [7] 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 types of rattlesnakes is Arizona, with 13. [8]

Members of some Christian sects in the Southern United States are regularly bitten while participating in " snake handling" rituals. Snake handling is when people hold venomous snakes, unprotected, as part of a religious service inspired by a literal interpretation of the Bible verses Mark 16:17–18, which reads, "In my name ... They shall take up serpents ...." [36] [102] In traditional medicine [ edit ]Climate Changes Faster Than Species Can Adapt, Rattlesnake Study Finds", Science Daily, Dec. 05, 2011 The rattlesnake became a symbolic animal for the Colonials during the Revolutionary War period, and is depicted prominently on the Gadsden Flag. It continues to be used as a symbol by the United States military, and political movements within the United States. Goldfrank, Lewis R., ed. (2006). Goldfrank's toxicologic emergencies (8thed.). McGraw-Hill Professional. p.1657. ISBN 978-0-07-147914-1.