The average lifespan is between 13- 18 years old in captivity and 10 – 15 years in the wild. Most snakes are relatively small, about a meter long. This type of reproduction is known as ovoviviparous. Timber rattlesnakes are viviparous, meaning they give birth to live young. Rattlesnakes give birth live, and can have up to 25 babies (called 'neonates') in a brood. Full grown rattlesnakes can range from 3 to 7 feet in length. As they often live in disguise to hunt prey, humans sometimes inadvertently end up stepping on them. Female rattlesnakes only reproduce once every two years and carry the eggs inside their bodies for about 90 days. The venom is mainly hemotoxic and attacks the victim’s blood system.-Western Diamondback Rattlesnakes have heat The eastern diamondback rattlesnake is the largest venomous snake in North America. The pupils of the eyes are vertically elliptical. 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. -Western Diamondback Rattlesnakes can live to over 20 years.-These rattlesnakes use venom to immobilize their prey that includes birds, reptiles, and small mammals. 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. All rattlesnakes are ovoviviparous, meaning their eggs hatch inside their body and they give birth to live young. Rattlesnake Reproduction. Newborn diamondbacks are 12-15 inches long and resemble their parents, except their tails end in smooth buttons rather than rattles. This largely varies depending on which type of snake it is. It is Michigan's only venomous snake, and one of only two rattlesnake species that occur in the Great Lakes region. They actually give birth to live young. There are 36 identified species of rattlesnakes as of 2014. A rattlesnake can move the rattle on its tail back and forth 20-100 times in just one second. The average rattlesnake can live 15 to 20 years. Females seek burrows or hollow logs to give birth to between 6 and 21 young. Although rattlesnake bites are dangerous, the recorded fatality rate from their bites is quite low. Some snakes are immune to the poison of rattlesnakes. A wide range of rattlesnakes live across the U.S. and North America, and some varieties live in South America as well. Prairie Rattlesnake . As with most reptiles, snakes live a long time compared to dogs or cats. 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. Rattlesnakes do not lay eggs in nests. 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