Mice can enter through gaps narrower than a pencil width, then nest inside wall voids, an attic, basement, or crawl space. A few clues can quickly become a mouse infestation if food, warmth, and shelter stay accessible. https://micecontrolincanada105940.blogunteer.com/41964291/overview-professional-mice-control-services-in-kawartha-lakes-for-homes-and-businesses