This question, we receive from many of our customers and it usually points to a raccoon intrusion.  Raccoons are one of the largest creatures in the Houston area that readily enter attics either for breeding or to take advantage of a warm safe place to sleep in the insulation they find there.  If “heavy’ foot steps are heard, its usually raccoons who are the culprits.  The sound of raccoons in attics and walls are very different from the scratching and scampering of rodents and are in a class of their own.  It is important if you suspect of one or more raccoons in your home or business to contact a professional wildlife company such as Elite Wildlife Services.