Pillbugs are backyard inhabitants they are names pill bugs because they can roll into ball-like old-fashioned pill Pillbugs breathe through their gills their gills are very thin and located underside of their body. They share a lot of similarities with sowbugs their body is very similar and the things they require to live and pillbugs have to live in moist areas because their gills need moist to function correctly, so they always live in most areas.