How Are Centipedes Different From Millipedes?
Both have long segmented bodies and too many legs, and both end up inside homes in North Texas. But centipedes and millipedes are completely different animals with different behaviors, different risks, and different explanations for why they are showing up in your house. Knowing which one you are dealing with tells you what to do next.
The Fast One Is a Centipede. The Slow One Is a Millipede.
The easiest way to tell them apart is movement. Centipedes are predators – they hunt live insects, move extremely fast, and will bite if handled. Millipedes are decomposers – they eat decaying plant matter, move slowly, and curl into a ball when disturbed rather than running or biting.
- Centipede body shape. Flat and elongated, with legs that extend out to the sides. House centipedes (the most common indoor species in North Texas) have very long, delicate legs arranged in pairs along each body segment – one pair per segment. At full speed, they look almost liquid crossing a floor.
- Millipede body shape. Round and cylindrical, with legs tucked underneath. Each body segment has two pairs of legs instead of one. They do not sprint – they flow slowly in a wave-like motion.
- Leg count difference. A centipede always has an odd number of leg pairs (so the total leg count is never divisible by four). A millipede always has two pairs per segment, giving an even total. In practice, you will not count legs – just watch the movement.
What They Tell You About Your Home
Finding either one inside is a signal, but the signals mean different things.
Centipedes inside your home mean two things: there is a moisture problem somewhere, and there is prey for them to hunt. House centipedes do not wander in by accident – they follow their food supply. If centipedes are appearing regularly in your bathroom, basement, or utility room, there are enough insects in that space to sustain a predator. The centipede is not your pest problem. It is the symptom of a pest problem.
Millipedes inside your home are almost always a moisture issue outdoors that has overflowed indoors. They live in mulch, leaf litter, and decaying wood – anywhere organic matter decomposes in a moist environment. Millipede invasions in McKinney and Allen homes typically happen after wet weather when the outdoor population explodes and nearby soil becomes saturated. They migrate toward dry ground and end up inside through foundation gaps and door sweeps.
Can They Bite or Hurt You?
Centipedes in North Texas can bite if directly handled. The house centipede has venomous forcipules (modified front legs) that it uses to immobilize prey. A bite on a human causes localized pain and redness, similar to a mild bee sting. It is not dangerous for most people. Children and people with known sensitivities should avoid handling them. Centipedes will not bite unprovoked – they bite when trapped against skin.
Millipedes cannot bite. When threatened, they curl into a defensive coil and may secrete a mild defensive fluid from their body segments. This fluid can cause minor skin irritation or temporarily stain skin. Do not rub your eyes after handling a millipede. Otherwise they are harmless.
How to Reduce Their Presence
Both centipedes and millipedes are moisture-driven. Reducing moisture both inside and outside your home is the most effective long-term control approach.
- Fix any leaks under sinks, around water heaters, or in crawl spaces
- Run a dehumidifier in basement or utility areas that stay damp
- Move mulch, wood piles, and leaf litter away from the foundation – 6 inches of clearance minimum
- Replace weatherstripping on doors and seal gaps around pipes at the foundation
- Fix crawl space ventilation if that area stays persistently damp
If centipedes are appearing frequently inside, a pest inspection makes sense – not to treat the centipedes themselves, but to find what they are feeding on. Common prey includes silverfish, firebrats, and small roaches living in the same damp areas. Treating the prey population removes the food source and the centipedes follow. Contact us if you are seeing regular centipede activity in Frisco, Prosper, or anywhere in Collin County.
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