Earwigs: The Pincers Are Real, the Ear Myth Isn't

An earwig is easy to identify the moment it's seen: a reddish-brown insect roughly three-quarters of an inch to an inch long, with a pair of pincer-like appendages, called cerci, projecting from the rear of its body. Earwigs belong to the insect order Dermaptera, with more than 2,000 described species worldwide and the greatest diversity found in tropical regions — which includes most of India. Despite how unsettling the pincers look on first encounter, almost everything commonly believed about this insect's name is simply untrue.

The myth that gave the insect its name

The name "earwig" comes directly from a long-standing folk myth: that these insects crawl into the ears of sleeping people to lay eggs or burrow into the brain. This is an urban legend with no factual basis whatsoever. Earwigs have no biological interest in human ears, and there's no credible evidence of this ever happening in the way the myth describes. It's a classic case of an insect's common name outliving the folklore that produced it by centuries.

What the pincers are actually for

The cerci are real and functional, just not for the reason the myth suggests. Earwigs use them for a range of ordinary purposes: grabbing prey, intimidating predators, and fighting other earwigs over territory or mates. There's also a reliable identification detail in the pincers themselves — males typically have larger, more noticeably curved cerci, while females have straighter, narrower ones. Importantly, an earwig's pincers aren't strong enough to break human skin, and while an earwig may pinch if handled roughly, it isn't a meaningful safety concern.

Where they actually live, and why damp conditions matter

Earwigs are nocturnal and strongly drawn to moist, humid environments. Outdoors, that typically means piles of wet leaves, garden mulch, grass clippings, compost, and the undersides of boards or woodpiles — anywhere consistently damp and sheltered from light. Their diet is broad and largely unremarkable from a pest-control standpoint: mosses, lichens, algae, fungi, and small insects, dead or alive. On their own, earwigs aren't considered a destructive household pest in the way termites or carpet beetles are; they're more accurately described as a nuisance invader that tends to follow damp conditions indoors rather than one that causes structural or fabric damage.

The surprisingly devoted parent

One detail sets earwigs apart from almost every other non-social insect: genuine maternal care. Research on earwig species has found that mothers lay a batch of eggs — commonly in the range of 50 to 90 — in an underground chamber each season, then stay with them rather than abandoning the clutch, as most solitary insects do. Documented maternal behaviour includes grooming the eggs to defend against fungal infection, and in some species, actively bringing food back to the nest for newly hatched nymphs by regurgitation, a behaviour that measurably improves the young's survival rate. This kind of sustained parental investment is considered unusual enough among insects that it's been specifically studied as a notable exception, since earwigs aren't social insects living in organised colonies the way ants or bees are.

Why they end up indoors, and what that usually means

Earwigs move indoors for the same reason several other nuisance invaders do: they're following the damp, cool conditions they already prefer outside, often after heavy rain shifts moisture levels around a building's foundation. Finding an earwig or two near a damp bathroom, basement, or entryway mat isn't typically a sign of an infestation requiring aggressive insecticide treatment — it's usually a sign that the same humidity and entry-point conditions that exist outside have simply extended a little further in.

• Clear damp leaf litter, mulch, and grass clippings away from the base of exterior walls, since this is their preferred outdoor habitat and the most common source of indoor wanderers.
• Reduce consistently damp spots indoors — leaking pipes, poorly ventilated bathrooms, damp basements — which make a property more attractive to earwigs and several other moisture-seeking pests at once.
• Seal obvious gaps around doors, windows, and foundation cracks to reduce how easily they wander in from outside.
• Treat an occasional single earwig as a minor, low-concern sighting rather than an emergency — the pincers look alarming but aren't dangerous to people.
• If earwigs are showing up indoors repeatedly rather than as rare strays, that's worth a professional look at the underlying moisture or entry-point conditions rather than repeated spot-treatment.

Earwigs are rarely a serious pest on their own, but a recurring indoor sighting is a useful early signal of damp conditions worth addressing before a different, more damaging moisture-loving pest takes advantage of the same conditions. A free Sevacorp inspection can check for exactly that kind of underlying issue.

• Sources:
• Maine Department of Agriculture, Conservation and Forestry (via Harvard) — "Earwigs: Identification; Biology; and Control" — https://www.maine.gov/dacf/php/gotpests/bugs/documents/Earwig-harvard.pdf
• NC State Extension — "Earwigs" — https://content.ces.ncsu.edu/earwigs
• National Center for Biotechnology Information (PMC) — "Progressive Provisioning by the Females of the Earwig, Anisolabis maritima, Increases the Survival Rate of the Young" — https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3016708/