Squirrels are small creatures, and the openings they can squeeze through are even smaller. Once inside your home, these critters may build a nest using your attic insulation, or attempt to leave for food and become trapped. When this happens, they will do anything to get free, including chewing holes in your walls, eaves, or soffits. When they decide to nest in your home, they will stay as long as they can, damaging and soiling your home the entire time.