the highest size that a snake can get up to
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.