Common Pill Bug

Scientific Name: Armadillidium vulgare

Order & Family: Order Isopoda, Family Armadillidiidae

Size: Typically 8 to 18 mm in length.

Common Pill Bug

Natural Habitat

Damp environments such as leaf litter, under rocks, logs, or in mulch where high moisture levels exist.

Diet & Feeding

Mostly detritivores, feeding on decaying plant matter, algae, and occasionally young plants or fungi.

Behavior Patterns

Nocturnal crustaceans that roll into a ball (conglobation) when threatened; they breathe through gill-like structures and must remain moist to survive.

Risks & Benefits

Generally harmless to humans; they benefit the ecosystem by breaking down organic matter and recycling nutrients into the soil.

Identified on: 6/17/2026