Mouse Female
My female mouse had babies without a male mouse?
I got 3 female mice from the pet store about a year ago. One died immediately, and another died about 3 or 4 weeks ago. Yesterday, I look in the one remaining mouses cage, and there are a whole bunch of babies. They are all alive and she is taking good care of them, but she has never come in contact with a male mouse, and all the mice in the pet store were checked to see if they are male and female and were separated accordingly. How did this happen???!!!!???
A mouse's gestation period is around 20 days. That fits in perfectly with the mouse that died 3 weeks ago. But it seems pretty unlikely to be honest, especially since they have never bred before (depending on how long you've had them).
The other possibility I am considering is impregnation by a wild mouse. Might you have field mice snooping around your home? It is very easy for rodents to mate through the bars of a cage, so I am thinking that is what most likely happened. Even if you do not have wild mice, perhaps one snuck in somehow? When I had a male mouse, he would always know when the females were in heat, so a mouse could have gotten in because your females attracted him.
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