Millipedes are not insects. Millipedes belong to the arthropod class Diplopoda that means "two footed" or "double footed." Millipedes should not be confused with centipedes that bear only one pair of legs per body segment. They usually have only 60 legs, not a thousand as its name suggests. They prefer to live in moist places, including under large rocks, beneath pine bark or straw mulch, in well-kept lawns, and under wood. They lay their eggs in the soil during the spring and summer and usually overwinter as adults. Millipede migrations normally take place during dry spells, often in the fall of the year. At such times, millipedes move across lawns or fields and into houses en masse, searching for moisture. While they do no real damage to homes, their mere presence is a nuisance, and often they give off a foul odor.