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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.
The average life span of rats is 2â3 years; mice 1â2 years. The average body length of adult rats is 9â11 inches; mice 3â4 inches; with an average tail length of 7â9 inches in rats and 3â4 inches in mice.The average body weight for rats is 350â450 grams for a female, 450â650 grams for a male; mice 30 grams each sex.There have been a few adult male rats that weighed 2 pounds!or two small rats, use a 15â20-long gallon tank or 14x24x18 (approximate) wire cage (minimum sizes; preferably larger) for their housing. Two female mice may be housed in a 10 gallon tank, one male mouse in a 5â10 gallon tankâthis will provide adequate room for a house, wheel, feed dish, and water bottle.