Bug Identifier
Pill Bug (Woodlouse / Roly-poly)
Community identification

Pill Bug (Woodlouse / Roly-poly)

Armadillidium vulgare

Order & Family
Order Isopoda, Family Armadillidiidae
Size
8.5 - 18 mm (0.3 - 0.7 inches) in length
See this bug in the Encyclopedia

Natural Habitat

Damp, dark places under rocks, logs, leaf litter, decaying wood, mulch, and soil, as they require moisture to breathe through gill-like structures.

Diet & Feeding

Detritivore; feeds primarily on decaying plant matter, dead vegetation, leaves, fallen fruit, and occasionally young tender living plant roots or seedlings.

Behavior Patterns

Nocturnal invertebrates that exhibit 'conglobation'—the ability to roll up into a tight ball when threatened or to retain moisture. They undergo molting in two stages (back half first, then front half).

Risks & Benefits

Completely harmless to humans (no bite or sting). Highly beneficial to ecosystems as decomposers that enrich soil quality and break down organic waste, though large populations can occasionally damage delicate young garden seedlings.