Particularly vulnerable to damage from squirrels is the insulation found in attics. They are also known for chewing wiring that is housed in the attic. Worse, though, is the scope of damage squirrels are able to do to the external part of the attic. With every additional litter born, squirrels will continue to branch out and seek space to construct nests of their own. Failure to halt the expansion of the squirrel population will lead to additional holes being opened all around the attic space. The longer an infestation is allowed to continue, the greater the number of entry points will be created.