Termite

A cockroach with social tendencies

Modern phylogenetics has revealed that termites are derived cockroaches — specifically, they evolved from wood-eating social cockroaches related to today’s Cryptocercus genus. Termites have been reclassified into the order Blattodea (the cockroach order), though the older name Isoptera persists in some references.

This places termites and ants — which are often visually similar — in completely different parts of the insect tree. Ants are derived wasps. Termites are derived cockroaches. Their similar social structures evolved independently through convergent evolution. The two groups also compete for resources and often fight when their colonies meet.

Eusocial colonies

Termites are one of fewer than 10 evolutionary lineages that have evolved eusociality — true collective living with reproductive division of labor. Most termite colonies have:

• A queen (and sometimes a king) — the only reproductive members.
• Workers — sterile, do all foraging, building, feeding, brood care.
• Soldiers — sterile, modified for defense (often with massive heads or chemical glands).
• Reproductives in waiting — winged future kings and queens that disperse to found new colonies during seasonal swarms.

Some termite queens live decades and lay thousands of eggs per day. African mound-building queens are physogastric (their abdomens swell to enormous sizes from constant egg production) and have been measured at 25–30 g — vastly larger than the workers around them.

Cellulose digestion

Termites can digest wood — most animals can’t. The trick isn’t the termites themselves but the microbial symbionts living in their guts:

• Lower termites (most subterranean species) host protozoa and bacteria that ferment cellulose.
• Higher termites rely entirely on bacteria.
• Some termites cultivate fungus in dedicated chambers, feeding it pre-chewed wood and eating the fungus.

The microbial communities in termite guts are remarkably stable — passed from one generation to the next through trophallaxis (mouth-to-mouth feeding). Antibiotics that kill the gut microbes essentially starve the termite.

Mound architecture

Some termite species build the most sophisticated structures of any non-human animal. African and Australian termite mounds can:

• Stand over 9 meters tall.
• House millions of individual termites.
• Maintain interior temperature within ±1 °C of optimal year-round, despite extreme outside temperature swings.
• Channel airflow through internal vents like passive HVAC systems.
• Last for decades to centuries.

The Eastgate Centre in Harare, Zimbabwe, is a building deliberately designed using termite-mound principles for passive cooling. It uses 90% less energy than comparable conventional buildings.

Property damage

Subterranean termites in the United States cause an estimated $5 billion in property damage annually — more than fires and storms combined. Most damage happens silently within walls, only discovered when structural elements fail. Modern building codes require pest barriers and careful wood treatment in much of the southern U.S.

Two distinct termite types matter for buildings:

• Subterranean — live in soil, build mud tubes to access wood; require moisture contact with the ground.
• Drywood — live entirely in wood, no soil contact required; harder to detect and eliminate.

Edible biomass

In many cultures, termites are a traditional food. Termite alates (winged reproductives) emerge in mass swarms in tropical regions, and people gather them by the kilogram, fry them in their own oils, and eat them as a high-protein, high-fat snack. Termite mounds have also been an important source of mineral-rich soil in some sub-Saharan agricultural systems.