Millipedes thrive in moist environments, particularly where decaying leaves, wood, and other organic materials are available.
A basement can provide several conditions that attract them.
Excess Moisture
Damp floors, leaking pipes, condensation, and poorly ventilated corners can create favorable conditions for millipedes.
These creatures need moisture to survive, so they are more likely to appear in humid areas than in dry rooms.
Heavy Rainfall
After periods of heavy rain, millipedes may leave saturated soil and seek shelter in buildings.
They can enter through small openings around doors, windows, foundations, and utility pipes.
Decaying Organic Material
Dead leaves, decomposing wood, and accumulated garden debris provide food for millipedes outdoors.
If these materials are close to your basement entrance, they may contribute to the number of millipedes you encounter indoors.
Small Entry Points
Cracks in foundations, gaps beneath doors, and damaged window seals can allow millipedes to enter.
Even if your basement looks clean, these small openings may provide an easy route inside.
5. What Do Millipedes Eat?
Millipedes play an important role in the natural environment.
Most species feed on decomposing leaves, dead plant material, and other organic matter. By breaking down this material, they help return nutrients to the soil.
Unlike many common household pests, millipedes generally do not seek out human food, clothing, or furniture.
Some species may occasionally feed on tender plant material, particularly when other food sources are limited, but most are beneficial decomposers.
Their presence outdoors is therefore not necessarily a bad thing.
6. Millipedes vs. Centipedes: How Can You Tell the Difference?
Millipedes and centipedes are often confused because both have elongated bodies and numerous legs. However, they differ in several important ways.
Millipedes:
- Usually have rounded, cylindrical bodies.
- Typically have two pairs of legs on most body segments.
- Move relatively slowly.
- Often curl into a spiral when disturbed.
- Primarily feed on decaying plant material.
Centipedes:
- Usually have flatter bodies.
- Have one pair of legs per body segment.
- Often move much faster.
- Are predators that feed on insects and other small animals.
- Have venomous appendages used to capture prey.
Centipedes can bite if handled, and some species can cause significant pain. Therefore, it is helpful to identify which animal you are dealing with before attempting to handle it.
The rounded body and tightly coiled posture in the photograph are more consistent with a millipede than a typical centipede.
7. What Should You Do If You Find One in Your Basement?
If you discover a millipede indoors, follow these simple steps.
Step 1: Avoid touching it with bare hands.
Although most millipedes are harmless, some release defensive chemicals. Keep children and pets away while you remove it.
Step 2: Use a container and a piece of stiff paper.
Place a container over the millipede, carefully slide the paper underneath, and lift the container.
Step 3: Release it outdoors.
Place it in a sheltered area with soil, leaves, or other natural material away from your home’s entrances.
Step 4: Check the surrounding area.
Look for damp corners, leaking pipes, wet cardboard, and other conditions that might attract additional millipedes.
Step 5: Reduce moisture.
Repair leaks, improve ventilation when possible, and use a dehumidifier if your basement is persistently humid.
These steps are often sufficient when only one or a few millipedes are present.
8. How to Prevent Millipedes From Entering Your Home
See more on the next page