Millipedes
Sometimes called "thousand=leggers," but they usually have 30 to 90 pairs of legs. There are about 1,000 species in the U.S.

Habits: They have high moisture needs and are typically found in areas of decaying vegetation such as under trash, piles of grass clippings, flower bed mulches, leaf litter, etc. At certain times, they migrate by the hundreds.

Potential hazards: They feed on plants for moisture. Some species give off an ill-smelling fluid which is toxic to small animals and can cause blisters on human skin.

Control: Elimination of moisture sources is the key. Residual pesticides are effective but must be properly applied.

Prevention: Eliminate moisture sources. Dethatch the lawn and remove any standing piles of debris such as firewood, rocks, mulch, etc. Ventilate crawl spaces to eliminate damp shelter.