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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.
Quick Answer. Bats in the wild live an average of 10 to 20 years. This depends on surviving to adulthood; young bats have a high mortality rate. After the first three weeks of life, they learn to fly, which improves their chances of survival. Continue Reading.