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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.
Characteristics: Norway rats have brownish fur, a yellowish-white belly and a scaly tail. Size: Adults generally weigh between 10 and 18 ounces and can reach lengths up to 18 inches, from nose to tail. Lifespan: The typical Norway rat in the city lives about six months to a year.