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Adult mice have bodies that are 3-4 inches long with 3-4 inch tails. Adult rats are far heavier and longer: they can weigh ten times as much, averaging 350-450 grams for females and 450-650 for males (with an overall range of 200-800 grams). They have 9-11 inch long bodies and 7-9 inch tails (ref).
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.