Do mice kill each other?

[blackcrystal22]

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 would breed only rats, but its so inconsistent with the requirements needed for my corn snakes.

When I used to have mice (which I have to get some soon) they ate each other a lot for no reason.
Had food, and water. Just pecking order I suppose.