Animal proofing and exclusion are the most important aspects of your wildlife control part. After a den has been evacuated, blood, hair, urine, feces, and occasionally even carcasses are left behind, thereby making the den site into an open house. If no animal is present to protect the territory, a skunk, squirrel, or raccoon will simply move in, and your problem will return to square one. This can be a complete nightmare if damage restoration has already been accomplished.