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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.
updated 2/4/16. Note about wild rats: Please see the info at the bottom of the page. Baby rats are about 1 Â¼ inches (3.2 cm) long at birth, and are pink and hairless. House mice are only about Â¼-inch (0.64 cm) long at birth. Deer mice, which is a common wild species found as orphans, are about one inch (2.54 cm), long at birth. All of these species start getting fur at about one week of age.