Termite mounds or tubes protruding from a driveway. Termites are home owners pests because they eat wood, creating tunnels which weaken homes and buildings made of wood. They cannot absorb the wood they it until the cellulose is converted into a soluble substance by protozoans, Trichonympha, that live in the termite's digestive tract. (See my micrograph of Trichonympha in the Micro Zoo) There are more than 50 species of termites in the US. Of the 4,000 species of termites around the world, approximately 400 are significant pests in causing structural damage to buildings, crops or plantation forests. They live in colonies containing hundreds to millions of nymphs, workers, soldiers and queens.