He is similar to his cousin, the centipede, but moves more slowly, curls up when disturbed and has four legs per body segment instead of two. Centipedes bite, but I have seen few centipedes around here. Millipedes are numerous, though, and show up on porches and in houses, often curled up and dead. Since they are helpful, I would try to ignore them. If they get too numerous, sprinkle Sevin dust in the lawn at the edge of the house or patio to kill a few of them.
Earthworms are one of a garden's best friends.
They aerate the soil and fertilize it with their droppings. They can be very numerous in areas and leave many mounds of soil that looks granulated. When you look closer, you see the soil has a tube-like appearance. This is because it has passed through their bodies. They do not often become a problem, but some people believe they can become so numerous that they cause turf to become thin in areas.