No, that's not a good idea. The Gunineapig will most likely pick a fight with the mouse and kill it. So no.
Nope.
You can put a new mouse in the same cage as another, but if your mouse prefers living alone, don't put the mouse in the cage. The older mouse should be better off solitary.
in a cage
Probably not. But I read a book in my school library about gerbils and the author of it said that one of his friends put a gerbil and a mouse together in a cage and they worked out OK.
Wood shavings
yes
if a mouse can stick it's head through an area, it can get it's body through. if your unsure if your mouse can get out of a cage or not, put the mouse in the cage and close the doors of the cage, then put cage(with mouse in it) in bathtub overnight. if mouse gets out, your mouse will be safe in the bathtub(shut the drain of the bathtub) I hope this info will help
no
no they will fight, and some babies may die.
NO
if you don't buy the male mice at the same time while their in the same cage they would fight bitterly but 2 females might not have a problem with each other but the safest way to get 2 mice at a time is from the same cage.
No don't do it Plz don't do it B <---Just ignore it.
You should not keep a rat and a mouse on the same cage together, The rat will most likely kill the mouse as that is their natural instinct.