Pillbugs, also known as roly-polies, are small, terrestrial crustaceans belonging to the order Isopoda. They are commonly found in moist environments, such as gardens and forests, where they feed on decaying plant material. Unlike insects, pillbugs have a segmented body and a hard exoskeleton, which helps protect them from predators. These creatures are unique because they can roll into a ball when threatened, a behavior that gives them their nickname. Pillbugs breathe through gills, which is why they need to stay in damp areas to prevent drying out. They play an important role in the ecosystem by aiding in the decomposition of organic matter.