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Their sense of touch is also highly developed; due to their poor eyesight a lot of movement is interpreted through the utilization of whiskers and guard hairs to orientate themselves and determine their surroundings. Female mice have a gestation period of 19 to 21 days and may have up to 15 litters a year, due to their ability to become pregnant again within 24 hours of giving birth. The average litter size is 10 to 12 pups who are born deaf

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