We no longer leave anything soft (such as cushions off sunloungers, gardening fleece and mesh) out in our shed over winter, because mice have eaten huge holes through them in the past.
Last year, I discovered that a mouse had been visiting the glove compartment in our car (parked outside next to the road). It had chewed all the fabric covering off something that was in there, and chewed right through the corners of the metal container beneath!
As yet, I haven't heard anything too disturbing from our loft this season - we've had rats, mice, squirrels and bats in there over the years (not sure why the bats disappeared, unless they didn't like the rodent invaders!) so I'm sure it's only a matter of time.