House Centipede

Not really. The house centipede has venom, delivered through a pair of modified front legs called forcipules that it uses to kill insect prey, and a large one that is trapped against skin can attempt to bite. But its jaws are small and weak by human standards and often cannot break the skin at all; when a bite does register, the effect is a short-lived localised sting, roughly comparable to a mild bee or wasp sting, with a little redness and swelling that fades within an hour or two. There are no serious medical cases attributed to house centipedes. They are not aggressive, they run from light and movement, and they have no interest in people, only in the insects sharing your home.

An adult house centipede has 15 pairs of legs, and because the legs get progressively longer toward the back, the animal has a distinctive teardrop outline and can move without the front and rear legs tangling. That leg design, combined with a light body and a fast nervous system, makes it one of the quickest arthropods for its size, able to sprint across a wall or ceiling at around 0.4 metres per second. The speed is for catching prey and escaping predators. The legs also serve as a sensory array, picking up faint air movements from an approaching insect or threat, and the centipede can use them like a lasso, flinging several legs over a cluster of small insects to pin two or three at once.

They need humidity. House centipedes breathe through spiracles that lack the closing valves most insects have, so they lose water easily and die quickly in dry air. In their native Mediterranean range they live outdoors under stones and litter, but in cooler, drier climates the only reliably damp, mild, prey-rich habitat available year-round is often inside human buildings, specifically the humid lower levels — basements, cellars, crawl spaces, bathrooms, and around drains, sinks, and washing machines. They are also drawn to those areas because that is where their prey, especially silverfish and cockroaches, congregates. Reducing indoor humidity and sealing gaps is the usual way to discourage them.

From a pest-control point of view, leaving it alone is the better choice. House centipedes are predators of exactly the household pests people least want — cockroaches, silverfish, firebrats, carpet beetle larvae, ants, and even bed bugs and spiders. A house with house centipedes usually has fewer of those other pests as a result. The centipedes do not damage food, fabric, wood, or the building, do not carry disease, and do not form nests or infestations in the way roaches or ants do; you simply see the occasional individual. If their presence is genuinely unbearable, the effective long-term fix is to dry out and de-clutter the damp areas and cut off the insect prey that is feeding them, which removes the centipedes too.