We actually had a mouse climb into the parakeet cage and eat their food (to my horror, I found droppings in their bowl one morning). They didn't touch Yoda's food, but quaker parrots are pretty territorial, so my guess is that any mouse that ventured in there would regret it pretty quickly.
We eventually caught them (in quick kill traps, we are not a catch and release household when it comes to mice), but it was just gross knowing they were there.