Rattlesnake Reproduction. Females seek burrows or hollow logs to give birth to between 6 and 21 young. It is a small- to medium-sized snake, with adult lengths averaging 2 to 3 feet. Most snakes are relatively small, about a meter long. As with most reptiles, snakes live a long time compared to dogs or cats. A wide range of rattlesnakes live across the U.S. and North America, and some varieties live in South America as well. Rattlesnakes are very long-lived—about 15 to 20 years, or more—relative to their body size because they’re really good at conserving energy. Following a gestation period of 4-5 months, females give birth to 4-14 (average 9) young every three to five years between late August to mid-September. The average rattlesnake can live 15 to 20 years. The average lifespan is between 13- 18 years old in captivity and 10 – 15 years in the wild. Characteristics The Prairie Rattlesnake (Crotalus viridis) is a venomous pit viper with a diamond shaped head on a relatively thin neck.This leads to a fairly heavy body that can grow to five feet in length. The eastern diamondback rattlesnake is the largest venomous snake in North America. Some reach 8 feet in length and weigh up to 10 pounds. Timber rattlesnakes are viviparous, meaning they give birth to live young. Rattlesnakes do not lay eggs in nests. Rattlesnakes have also been harvested as human food. Some snakes are immune to the poison of rattlesnakes. This largely varies depending on which type of snake it is. A rattlesnake can move the rattle on its tail back and forth 20-100 times in just one second. With proper medical care, snakebites are normally cured and patients can recuperate. The extinct snakes of Titanoboa cerrejonensis were 12-15 m in length, but to date the longest reptile mesh python is about 10 m. On the other side of this line is a 10-centimeter crumb of Leptotyphlops carlae. Female rattlesnakes only reproduce once every two years and carry the eggs inside their bodies for about 90 days. Rattlesnakes give birth live, and can have up to 25 babies (called 'neonates') in a brood. As they often live in disguise to hunt prey, humans sometimes inadvertently end up stepping on them. Prairie Rattlesnake . -Western Diamondback Rattlesnakes can live to over 20 years.-These rattlesnakes use venom to immobilize their prey that includes birds, reptiles, and small mammals. It is Michigan's only venomous snake, and one of only two rattlesnake species that occur in the Great Lakes region. There are 36 identified species of rattlesnakes as of 2014. Newborn diamondbacks are 12-15 inches long and resemble their parents, except their tails end in smooth buttons rather than rattles. They actually give birth to live young. 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