Pill bug (English), more commonly known as a roly-poly

Scientific Name: Armadillidium vulgare

Order & Family: Order Isopoda, Family Armadillidiidae

Size: Up to 18 mm (approx. 0.7 inches) in length

Pill bug (English), more commonly known as a roly-poly

Natural Habitat

Moist terrestrial environments such as under rocks, logs, and leaf litter; also commonly found in gardens and basements

Diet & Feeding

Decomposing organic matter, including dead plant material and occasionally young plants

Behavior Patterns

Nocturnal; exhibits 'conglobation' (rolling into a ball) as a defense mechanism against predators and to prevent desiccation

Risks & Benefits

Harmless to humans; beneficial to the ecosystem as decomposers that help cycle nutrients back into the soil

Identified on: 6/11/2026