A "roly-poly" is a common name for the pill bug, a small, terrestrial crustacean that belongs to the order Isopoda. These creatures are often found in gardens and under rocks, where they thrive in moist environments. Roly-polies have a segmented, oval body that can roll into a ball when threatened, which is a defense mechanism against predators. Roly-polies are detritivores, meaning they feed on decaying organic matter, such as dead leaves and wood. This diet helps recycle nutrients back into the soil, making them important for ecosystem health. Unlike insects, roly-polies breathe through gills and require a humid environment to survive.