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I was having this same problem, as we live in a 120 year old house that mice and bats just love, until I discovered this magic trick! This really works well.For once there actually IS a better mouse trap! You can even buy kits on eBay for a few $ now and you supply the bucket. https://www.youtube.com/watch?v=pMZaJZ6x3bA
Don't know if this has been suggested before but take a look at this Canadian method of getting rid of mice and rats:https://www.automatictrap.com/collections/shop/products/a24-rat-and-mouse-trap-kit
Its hard to tell how big it is, but that is a rat trap 3-½ x 7Old Head