Did you know that the majority of phone calls (around 80 percent) received by the Humane Society’s Wildlife Services are about wild animals trapped inside someone’s home? The squirrel is the No. 1 culprit, and it gets inside through small cracks and open windows. Since squirrels tend to use trees as their “highway” of sorts, one of the easiest way to prevent squirrels from invading is to trim trees. Cut branches so they are at least 6 feet away from your home. This does two things: It makes your home less squirrel-friendly and also protects it during storms.