Answer
This is a hyper-aggressive mouse that may also be very territorial. Chances are, this pair was not raised up together, and was brought together when they were both adults. The male mouse might also be protecting the territory of his original mate, if he had one previously.
It would be a good idea to separate the two, and allow the female to mate with one of her sons.
First answer by Tenrunir.phase2. Last edit by Tenrunir.phase2. Contributor trust: 37 [recommend contributor]. Question popularity: 12 [recommend question]
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