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Wild Rats. In the wild, the life expectancy for a rat is much lower: 95 percent of wild rats die before they reach their first birthday. A 1-year-old rat would be around 30 years old in human terms. The most common cause of death in wild rats comes from predators, such as owls, hawks and foxes.
The yellow rat snake is the southeastern representative of the black rat snake clan. It occurs naturally from southeastern South Carolina to the southern tip of Florida. The life span in captivity of a yellow rat snake is 17 to 20 years.