Millipede Identification Guide
Millipedes are slow-moving, worm-like arthropods with two pairs of legs per body segment. They're harmless to humans but enter homes in large numbers after heavy rain or in fall. Commonly misidentified as centipedes, millipedes are decomposers — they eat dead plant matter, not other insects.
Low concern
| Quick ID Reference |
|---|
| Size | 0.5–4 inches depending on species |
| Color | Dark brown to black, sometimes with orange/red |
| Legs | 2 pairs per segment (30–90+ legs total) |
| Movement | Very slow, curls into ball when threatened |
| Habitat | Mulch, leaf litter, soil, damp basements |
| Season | Spring after rain, fall migration indoors |
Frequently Asked Questions
Millipede vs. centipede — what's the difference?
Millipedes are slow, round-bodied, and have 2 leg pairs per segment. Centipedes are flat, fast, and have 1 leg pair per segment. Millipedes curl into a ball when threatened; centipedes run.
Why are millipedes invading my home?
Heavy rainfall drives them indoors as their soil habitat floods. They also seek warmth in autumn. Entry points are gaps around doors, windows, and foundation cracks.
Are millipedes dangerous?
Millipedes do not bite. Some species secrete a mildly irritating fluid that can stain skin or cause a rash — wash hands after handling. They pose no structural or health threat.
When should I call a pest control professional?
If you're seeing large numbers, finding entry points you can't seal, or if the infestation is affecting your quality of life, City Best Pest Control offers free inspections for Philadelphia, Montgomery County, Delaware County, and Bucks County residents. Contact us here.
