Bug Identifier
Pill Bug / Roly-poly
Community identification

Pill Bug / Roly-poly

Armadillidium vulgare (Common Pill Bug, though other species exist)

Order & Family
Order: Isopoda, Family: Armadillidiidae (for commonly found pill bugs like Armadillidium vulgare)
Size
Typically 6-18 mm (0.24-0.71 inches) long.
See this bug in the Encyclopedia

Natural Habitat

Pill bugs prefer dark, damp environments with access to decaying vegetation. This includes under rocks, logs, leaf litter, mulch, garden debris, and sometimes in basements or other moist indoor areas.

Diet & Feeding

Detritivore, primarily feeding on decaying organic matter such as dead leaves, rotting wood, fungi, and sometimes young plants or roots if other food sources are scarce. They play an important role in decomposition.

Behavior Patterns

Pill bugs are primarily nocturnal. They are known for their ability to roll into a tight ball when disturbed, a behavior called conglobation, which protects them from predators and helps conserve moisture. They reproduce sexually, and females carry their eggs in a brood pouch (marsupium) on their underside.

Risks & Benefits

Generally harmless to humans and do not bite or transmit diseases. They can be a nuisance if they enter homes in large numbers, often indicating high moisture levels. In gardens, excessive populations can sometimes damage tender plant seedlings. However, they are beneficial decomposers, contributing to soil health by breaking down organic matter and returning nutrients to the soil.