One of the main problems with wildlife infestations is the damage they cause. Just like pests, wild animals are looking for three things: food, water, and shelter. If they think your building can provide those three things, animals will do anything to get inside!
When the weather in the Midwest starts to cool in the late fall, a variety of wildlife may decide that your home seems like a nice place to spend the winter months. They are curious creatures and will often explore new areas in search of food.