She's probably not actually eating the styrofoam. Mice love chewing up
and shredding things like that. I'd probably take it away because it's
just going to make a mess -- give her some cardboard to chew on instead.
I've found mice to be as variable as people in their tastes. Some of
mine go crazy for peanut butter, some aren't that interested in it.
Some of them hate lab blocks, some (believe it or not) actually go for
the lab blocks first. Some will eat cheese, some don't like it (the
whole "mice love cheese" thing seems to be mostly a myth). One thing is
for sure -- no mouse is going to starve itself to death over pickiness.
They'll eat their food eventually if you don't give them anything else.
Anyway, mine eat more at night, and they don't eat huge amounts, so
maybe your mouse is actually eating and you don't realize it.
If you want to be sure your mouse is getting proper nutrition, you might
have to break down and get a homogenized food like lab blocks, so that
she can't just pick out her favorites. Mice will eat them eventually if
you don't give them anything else, though most don't like them much.
I feed my mice a rat mix prepared by the local pet store. It looks to
me like they just throw together several of their other bulk foods
including birdseed, parrot chow, hamster mix, lab blocks, and monkey
chow (my mice go nuts for the monkey chow, oddly enough), plus some
pasta wheels and dried fruit bits. My mice love it, or at least they
all find several things in it that they like since it's so varied. I
also feed them dry dog kibble.
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