For subterranean termite infestations, the most distinguishable sign is the presence of mud tubes or soil-like materials in the infested area. The mud tubes are passageways constructed by subterranean termites to travel from one point to another. The most common sign of infestations by drywood termites is the presence of faecal pellets that resemble sawdust around the infested items or structures. The exit holes where the faecal pellets are pushed out of the infested wood can also be seen on the surface.