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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.
Let's have a look at the other pet species. The oldest rabbit on record was a wild rabbit named Flopsy, who was caught on August 6, 1964, and died 18 years and 10 months later in Tasmania, Australia. The oldest ferret on record was about 15 years old. Some people say it was 14 years old. Today, some ferret owners claim their pet is 14 years old. This means that, even though a ferret's average longevity is 7 to 9 years, longer life spans are not so rare.