Armadillidium 's a genus of the small terrestrial crustacean known as the woodlouse. Armadillidium are also commonly known as “pill woodlice”, “pill bugs”, “potato bugs” or “roly-poly”, and are often confused with pill millipedes such as Glomeris marginata. They're characterised by their ability to roll into a ball when disturbed. They typically feed on moss, algae, bark and other decaying organic matter. They're usually found in moist areas such… (More on Armadillidium)