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並前往https://books.google.com.tw/books?id=c8O9AwAAQBAJ&pg=PT503&lpg=PT503&dq=2+months+old&source=bl&ots=Z22FOkv4RS&sig=ACfU3U2fuyL4D3173oQch2Na4F13S-JfBw&hl=zh-TW&sa=X&ved=2ahUKEwjmsY73-eb9AhVmjIkEHWyCCpQQ6AF6BQjZAhAD

Mammals of Colorado, Second Edition - Google 圖書結果

... mice are weaned at about 5 weeks and females may start breeding when 2 months old. Population turnover is high, and probably only 2–3 percent of animals ...

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