Do mice kill each other?

[ptate]

Mice dont have to be dehydrated, they are evil little suckers.
Thats why I only breed rats, they are much friendlier to people and each other.

All rodents will kill each other if left with no water, that much is true. But mice will kill for dominance, new members or babies are usually the targets, really nasty.

I only breed rats now too but back in the day I used to breed mice on a large scale and never had them kill each other for dominance. Not to say that it can't or doesn't happen but I never had it happen to me.