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* Sexual maturity is at ~9-12 weeks.
 
* Sexual maturity is at ~9-12 weeks.
 
* Monogamous (in contrast to [[Small_Mammals_-Rat-_Anatomy_%26_Physiology|rats]] and [[Small_Mammals_-Mouse-_Anatomy_%26_Physiology|mice]]).
 
* Monogamous (in contrast to [[Small_Mammals_-Rat-_Anatomy_%26_Physiology|rats]] and [[Small_Mammals_-Mouse-_Anatomy_%26_Physiology|mice]]).
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* Mating usually occurs in the evening.
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* Copulation plug is small and lies deep in the vagina, so cannot easily be detected.
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* Gestation period is 22-26 days.
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* Mean litter size is 4-5.
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* May produce a litter every 30-40 days and can produce a total of 10 litters.
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* Maximum breeding age is 20 months, but usually the time between the first and last litter is ~1 year.
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* Pseudopregnancy may occur.
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* Post-parturient oestrus.
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