Termites.  That is NOT something that anyone wants to hear during an inspection.  However, much like foundation movement, and hail damaged shingles, termites are part of our Lone Star Life.  Proper identification and treatment is just part of home ownership in North Texas.   Here you see mud tubes that subterranean termites have constructed.  They use these tubes as protection from heat and predators, and as a conduit back to the ground moisture.