Likewise, do female mice fight each other?
Females will fight for their children's safety. And sometimes, they just need to take a swing at the jerk who stepped on their tail. Whatever their reasons, if you keep more than one mouse in a cage, understand that they may fight. If they're males, you can expect it.
Similarly, can you introduce female mice to each other? Introducing new mice is quite easy providing you know the right way to do it. The following advice is for female fancy mice or neutered male to female group only. Male mice can be neutered, and after 6 weeks from their operation date has passed, they can be introduced to girls following these instructions.
Beside above, how many female mice can you keep together?
Put female mice together to avoid loneliness. Female mice usually like each other's company, so they won't fight, and they can't breed. If the females did not grow up together, you need to introduce them properly. Females should be kept in groups of 3 or more.
Are female mice territorial?
Rats and mice differ in their social organization and use of aggressive behaviors. Male mice are territorial and do not tolerate unfamiliar males within their home range (or cage). Females may establish territories but tend not to defend them with aggressive behavior.
