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Termites have biting mouthparts and are soft bodied, of moderate to small size. They live in dark nests and tunnels, except when the winged alates emerge to leave their parent colony. The bodies of flying individuals are dark, but termites which remain in the nest are whitish with only their heads being heavily pigmented. The temporary wings of termites are long and slender, in two pairs that are similar to each other. The veins near the anterior margin of the wing are strong and the rest are faintly marked. The wings are shed after the swarming termites find a new nest site.
''Formosan subterranean termites
Termites do not physically resemble ants, their "white ant" name probably being due to their similar social habits. The termite colony contains workers, soldiers, and reproductive individuals of both sexes. The workers are developed in subordinate castes in several species. The soldiers have large heads and strong jaws, and in some species are highly specialized. Many have jaws so overdeveloped that they cannot feed themselves without the assistance of workers, and varieties are known that squirt noxious turpentine-like liquid through a horn-like nozzle. In some colonies, the queen becomes enormous and quite helpless through the expansion of her abdomen as eggs develop. The workers feed and groom her and carry away her eggs to nursery chambers. Termites undergo incomplete metamorphosis, with their freshly-hatched young taking the form of small termites that grow without significant morphological changes.
Termites cannot themselves digest the wood that they consume. Instead they rely upon symbiotic protozoans in their intestines to digest cellulose for them, absorbing the products of the protozoan symbionts for their own use. This relationship is one of the finest examples of symbiosis among animals.
Because of their wood-eating habits, termites sometimes do great damage to buildings. Their habit of building tunnels wherever they go and of remaining concealed within the wood where they work often results in their presence being unknown until the timbers, riddled with tunnels until spongelike inside, give way. Once they have entered a building they do not limit themselves just to wood, also damaging paper, cloth, carpets, and other materials. In regions where termites are plentiful, no timber in construction should be left in contact with the ground. Exposed timber can be made resistant to attack by impregnation with creosote or other chemicals, but the most effective defence is a masonry foundation. Even so, termites are able to build tunnels with walls of packed earth over several feet of masonry or work through small cracks to reach wooden parts of a building. When termites have already penetrated a building, removing their means of access and destroying the colony with fumigation are usually effective means of stopping further damage.
In some regions, notably arid tropical savannas, termites construct extremely large and elaborate mounds to house their colonies. These termite mounds can have very distinctive forms, such as the compass termite which build tall wedge-shaped mounds with the long axis oriented north-south for maximum solar heating, and are as hard as concrete. Some mounds can reach heights of 20 feet (6 m) or more. The internal structure of these mounds can be quite complex, with ventilation chimneys for active temperature control, nursery and waste-disposal chambers, and a well-defended internal fortification containing the queen.
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