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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.
What is the average life span of a cat? The average lifespan of cats is much lower than the possible life expectancy, which is in a range from 10 to 17 years. The mortality rate for wild cats can be high, and most â¦ adult cats do not live 10 years, as they die of diseases, lack of nutrition, or accidents.