Racoons will eat just about anything which is why they are a familiar sight in and around your home. A female raccoon can have three to five young in spring or early summer and your attic, shed, chimney or deck can be the perfect birthing area. In this process, raccoons destroy the insulation and the inside of and attics with their fecal matter and urine.

Skunks will burrow out dens under any structure without a foundation, such as porches, decks, or sheds. Skunk spray is emitted when they feel threatened and this hard-to-remove spray can travel as far as ten feet. Each female skunk gives birth to between three and nine young each year and your deck or shed begins to look inviting as the fall season approaches.

Mice need to chew constantly in order to keep their teeth worn down. Mice will chew and gnaw through wood, wiring and insulation. Mice will burrow in the insulation and their feces and urine can lead to contamination not only in the insulation, but also the wood and drywall. A female mouse can produce anywhere from five to ten litters of 5-6 babies per year.

Little brown bats inhabit hot attics in homes, commercial buildings and churches. Bats give birth to one young per year between the months of May and July. They become active at dusk and gather at the exits of the home. Bat excrement produces an unpleasant odor as it decomposes in attics and wall spaces. Bat guano can lead to contaminates. Such contaminants can result in airborne particles of public health significance.