It is possible to hear termites moving within the walls of a house. The sound is not loud, but careful listeners notice a muffled tapping noise.
In addition to their sound, termites leave other signs that they are infesting a location. Termite droppings next to walls are common indications because these insects prefer that their own home territories are clean. Soft spots or tiny holes in wood are often signals that termites have already started damaging walls or decks. Wood that is discolored, sagging or blistered also suggests termite trouble. Outside a house, termites leave traces of themselves by constructing mud tunnels near the foundation.