쥐를 비롯한 대부분 설치류 임신기간이 3주 내외로 짧은 데다가 새끼를 한 번에 적게는 5마리에서 많게는 13마리까지 낳는다.
Most rodents, including mice, have a short gestation period of around 3 weeks, and give birth to as few as 5 to as many as 13 offspring at a time.