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Like other reptiles, rattlesnakes are âcold-bloodedâ or ectothermic, relying essentially on outside heat sources rather than an internal metabolism to maintain their body temperature. They typically function most effectively at temperatures between about 70 and 90 degrees Fahrenheit (21 to 32 degrees Celsius).
These snakes can live approximately 15-20 years in captivity. Size. This snake ranges in size from 3 to 5 feet long with a few reaching 7 feet long. Extra Fun-facts. 1  The rattle of the rattlesnake is made up of a protein called keratin (the same protein that your hair and fingernails are made of). 2  A new segment is added each time a rattlesnake sheds, but they can shed at different rates.