This information can be used to inform patients and their health care professionals as they decide the best course of treatment and to improve care for patients in the future. Information from registries may also be used to compare the performance of healthcare providers with regard to their outcomes and resource use.
Quick Answer. A house mouse that is a pet has an average life span of about two years. There have been mutant and calorie-restricted mice in captivity that have lived for up to five years.
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.