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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.
Life Span and Reproduction The average life span of an eastern cottontail in the wild is usually less than three years. In captivity, though, a cottontail rabbit can live up to eight years.