Name one common sign of a termite infestation.

A common sign of a termite infestation is the presence of mud tubes on walls or foundations. These tubes serve as protective tunnels for termites to travel between their nest and food sources, usually wood. Termites build these tubes out of soil, wood fragments, and saliva, allowing them to remain moist while foraging for food. Finding these mud tubes is a strong indicator of termite activity, as they are often found in areas where the termites are actively feeding.

In contrast, while water stains on ceilings may indicate potential moisture issues or leaks, they do not specifically point to a termite problem. Pest droppings can also signify various infestations, but they are not unique to termites and require identification to determine the species. Cracks in the foundation may suggest structural issues but do not directly indicate the presence of termites. Thus, mud tubes are the most distinct and recognizable sign specifically associated with termite infestations.