My OH was in a forest site "all on his own" (I had to work and went down the next day) and he got wakened by noise in awning. Turned on light and 2 squirrels were fighting on poles. He is not easily scared but says he will never do it again as frightened the life out of him at 3am.
That will teach him to try and get an extra night away without me. lol
So glad we have never encountered mice, the whole campsite would know something up when I scream if we ever do (hopefully never) just don't like them. I know they would probably more scared of us than us of them though.