pill millipede crawling

pill millipede crawling ground arthropod invertebrate segmentation exoskeleton soil fauna diplopoda sphaerotheriida armadillidiidae detritivore biodiversity ecosystem engineers aeration helpers organic matter recycling noninsect terrestrial creature nature wildlife environment habitat macro closeup outdoors natural forest leaf litter microhabitat ecology biology zoology entomology conservation species diversity arthropoda pillbug isopod crustacean myriapod