The formula for solving nuisance wildlife problems in structures are essentially the same for all animals. Seal up secondary openings, reinforce weak areas, and set traps, over and around the openings. Run the traps until you have caught all of the problem animals using the structure. In some instances it may be necessary to mark the entrance way with cardboard after the trapping program to ensure all problem animals have been removed. The reason it is important to understand the biology of the animals, is that it allows you to understand what you dealing with. Knowing that squirrels have 2 litters a year, male raccoon will kill baby raccoons, and male bats tend to live in small bachelor colonies in the summer. Allow you to tailor your control measures to that individual species.