Gray-brown, segmented shell; 14 legs; two antennae. Though terrestrial, pill bugs are related to sea crustaceans such as crabs and lobsters. They breathe through gills, requiring moist habitats.
Mostly nocturnal. Rolls into a ball when threatened or to prevent moisture loss. Sheds its outgrown shell. Females carry their eggs under their body until they hatch.
Pill bugs feed on moss, tree bark, algae, and animal remains, producing pungent ammonia in the process. They benefit their habitats by recycling decaying organic matter.
Moist soil with decomposing organic matter, including gardens, oases, and shorelines. Found in dark crevices under organic debris or stones. Burrows deeper into soil in dry seasons.