Right now I'm fighting with pesky mice. Our house has a high roof line so there is a bonus room with doors on either side opening into the attic. Until recently we hadn't really used the bonus room space, but when the whole work from home thing started we converted it into a playroom for our daughter with office areas for my wife and I. To keep the climate control better we started leaving the door at the top of the bonus room stairs open. I got woke up by a commotion one night to find one of our cats chasing a mouse around the house. Took us three days to catch the rascal. I finally figured out that somehow he had gotten into the attic, come out of a tiny gap under the door into the bonus room and the cat chased it downstairs.
I put a security cameras up there because only a small portion of that side is floored so I could see what was going on and traps. We caught several, but there is at least one more we've seen on camera but who is smart enough to avoid the trap. Ended up hiring a professional company to come in and deal with it. They go around and seal every possible opening inside and outside, literally search the attic (insulation and all) for the little rascals, and come back on a weekly basis until there are no signs of them being left. After that they offer a year warranty.