🐾 Animals

Beaded Lacewing Farts: The Larva That Kills Termites With Gas

Deep inside termite nests lurks one of nature's strangest assassins: the larva of the beaded lacewing, which subdues and kills its prey with a blast of lethal gas released from its rear end.

Nature's Flatulent Assassin

The beaded lacewing (genus Lomamyia, family Berothidae) is a delicate, inconspicuous winged insect as an adult, but its larvae rank among the most specialized predators in the insect world. These tiny grubs live inside the galleries of termite colonies, surrounded by the very insects they hunt. Rather than overpowering a termite by brute force — a risky move against a well-defended social insect — the lacewing larva deploys a chemical weapon. It positions itself near a termite and discharges a vapor from the tip of its abdomen, the anal region, that rapidly immobilizes the victim. In plain terms, the larva kills with a fart. This gaseous attack was first documented by entomologists in 1981 and remains one of the clearest known examples of an airborne toxin used offensively by a predatory insect.

The Chemistry of a Lethal Allomone

Scientists call the lacewing's weapon an allomone — a chemical released by one species that benefits the emitter at the expense of another. Unlike a pheromone, which carries signals within a species, an allomone manipulates a different organism, and here it does so with devastating effect. The compound is volatile, meaning it travels through the air as a vapor rather than requiring direct contact. When the larva waves the tip of its abdomen near a termite, the chemical diffuses the short distance to the target and triggers a rapid loss of movement. Remarkably, the substance is highly selective: termites are knocked out while other insects sharing the same space are left unharmed. This combination of airborne delivery, speed, and precision makes the lacewing's gas a favourite case study for chemists who investigate how insects weaponize simple molecules.

How the Larva Hunts

The hunting sequence is deliberate and precise. A first-instar larva — the youngest stage — approaches a termite and waves the tip of its abdomen close to the termite's head. Within roughly one to three minutes the termite stops moving, and shortly afterward it is fully paralyzed. The effect is so complete that the victim may remain alive yet motionless for up to three hours, giving the larva ample time to feed at leisure by piercing the body and consuming the contents. Crucially, the larva never needs to touch its prey: the gas does all the work from a distance. As the larva matures into later stages, its chemical arsenal grows more powerful, and a single individual can incapacitate several termites at once. This lets the tiny predator live surrounded by thousands of potential meals without ever risking a fight.

Why Scientists Find It Fascinating

The beaded lacewing's gas attack is a landmark example in the study of chemical ecology, the science of how organisms use chemicals to interact. It shows that a predator can wield a weapon that is airborne, fast-acting, and exquisitely targeted — a combination rarely seen outside human-engineered toxins. The specificity is especially striking: an allomone that floors termites yet spares nearby insects implies a finely tuned biochemical lock and key. Studying such compounds helps researchers understand how defensive and offensive chemistries evolve, and it can even hint at molecules of interest for pest control. For the casual observer, though, the appeal is simpler and more universal: here is a real animal that has turned flatulence into a genuine weapon, a fact that delights children and entomologists alike.

Did You Know?

The beaded lacewing larva can immobilize a termite in as little as one to three minutes without ever touching it.
A paralyzed termite may stay alive but motionless for up to three hours, serving as a fresh meal for the larva.
The larva's gassy allomone is selective — it knocks out termites while leaving other nearby insects unharmed.
Beaded lacewings belong to the order Neuroptera, the same group as the green lacewings gardeners prize for eating aphids.

Fun Fact

The beaded lacewing is one of the very few animals known to kill with what is, functionally, a fart — a vapor from its rear end that drops a termite in its tracks while leaving the bug next door completely unbothered.

Sources

Eisner, T. (2003). For Love of Insects. Belknap Press of Harvard University Press.
Eisner, T., Eisner, M. & Siegler, M. (2005). Secret Weapons: Defenses of Insects, Spiders, Scorpions, and Other Many-Legged Creatures. Belknap Press of Harvard University Press.
Gullan, P.J. & Cranston, P.S. (2014). The Insects: An Outline of Entomology (5th ed.). Wiley-Blackwell.
Resh, V.H. & Cardé, R.T. (Eds.) (2009). Encyclopedia of Insects (2nd ed.). Academic Press.

Created with AI assistance based on the scientific sources listed. Not a substitute for medical advice.

Go to Gallery 💨