pill millipede curled up on mossy ground

pill millipede curled mossy ground defensive position closeup forest floor arthropod invertebrate segmentation exoskeleton soil fauna diplopoda sphaerotheriida armadillidiidae detritivore biodiversity ecosystem engineers aeration decomposition helpers organic matter recycling noninsect terrestrial creature nature wildlife environment habitat macro outdoors natural leaf litter microhabitat ecology biology zoology entomology conservation species diversity