Pill bugs dwell in cool, dark places where there is decaying plant matter they can eat. Pill bugs have gill-like breathing structures and need to stay moist at all times to avoid dying. Pill bugs are an important food source for many other creatures and hide during the day.
Pill bugs, sometimes called sow bugs, roly-poly bugs or wood lice, are not true bugs, nor are they insects. Pill bugs are crustaceans and are closely related to crabs, shrimp and crayfish. They range in color from light brown to black. Diseased pill bugs may appear blue. Pill bugs have seven pairs of legs and two pairs of antennae. They are isopods that shed their exoskeleton several times during their lifetime. The average lifespan of a pill bug is from two to five years.