Millipedes are many-legged arthropods (not insects) related to lobsters and shrimp. They are long, slow-moving and resemble worms. Unlike worms, however, they have many body segments, each with two pairs of legs.

Millipedes live in dark, damp areas and feed on decaying plants. They are only found in the home when they wander in by accident.

Millipedes are harmless. They don't bite or feed on homes or their contents. They can be a nuisance, however, migrating up to 50 feet from woodland areas, usually in spring or fall, and entering homes through cracks and gaps. They are usually found in areas such as basements or garages. Millipedes have glands that produce an unpleasant odor, can cause an allergic reaction and can stain if they are crushed.

Keeping your lawn short (therefore drier), and removing hiding places such as dead leaves, mulch and rocks from near the foundation will help prevent millipedes from moving indoors. A residual insecticide labeled for use against millipedes can also provide an outdoor barrier to these migrating pests.