Last winter we had a mouse hanging out under some shelving in our kitchen. It was a tricky one. I set out a trap with peanut butter on it and the next day I would find the trap still set but all the peanut butter would be gone. The most surprising part was that the mouse actually chewed a hole in the baseboard inside a closet. I think it must have seen some old Tom and Jerry cartoons at some point. I imagine they are popular in the rodent community.