Pill Bugs

🔤 Taxonomy

Armadillidium vulgare is the accepted scientific name used for this feeder guide.

Common names used in the feeder trade:

• Pill bug
• Roly-poly
• Common pill woodlouse

📌 Description

Pill bugs are hardy terrestrial isopods used as cleanup crew and occasional calcium-rich feeders for small insectivores. They roll into a ball when disturbed, so some predators ignore them, but they are useful in bioactive setups and easy to culture.

Treat them more as cleanup-culture animals than as gut-loadable insects: leaf litter, calcium, and a moisture gradient matter more than short-term feeding before use. Offer only surplus from clean cultures and do not rely on isopods as a staple feeder.

🌍 Distribution

The species is native to Europe and has been introduced widely around the world with soil, plants, and human activity. Use captive-bred cultures and never release surplus isopods.

For keeper practice, biosecurity matters more than a precise range map: commercial feeder and cleanup-culture invertebrates are moved far outside their natural ranges, and escaped animals should never be released or treated as harmless.

⚖️ Regulations and safety

Armadillidium vulgare is not listed in the CITES Appendices in the official CITES checklist reviewed for this guide. No specific EU wildlife trade Annex listing was found for the species.

The EU Invasive Alien Species Regulation restricts species on the Union list; this guide does not treat Armadillidium vulgare as a Union-list species. Local and national rules can still restrict live invertebrate imports, transport, breeding, sale, use in schools or workplaces, and disposal.

The Bern Convention is not normally relevant because this is not a European native protected-species care issue. Keep cultures secure, never release live feeders, and freeze surplus or unwanted invertebrates before disposal where local rules allow.

🤌 Husbandry

A productive isopod culture needs a moisture gradient, leaf litter, decayed wood, calcium, hides, and ventilation. Keep one side damp and one side less wet; stagnant wet substrate is a faster problem than a slightly dry surface layer.

Good setup:

• Smooth-sided plastic tub or ventilated culture box
• Fine mesh or fabric ventilation sized for the feeder
• Dry food or base medium separated from wet food where possible
• Sorting container for feeding and cleaning
• Clear date labels for cultures and purchased batches

💡 Lighting

Feeder invertebrates do not need UVB. A normal room day-night rhythm is enough. Keep cultures out of direct sun because small containers overheat quickly.

🌡 Heating and temperature

Recommended ranges:

• Culture range: 18-24°C
• Tolerates cooler room temperatures
• Avoid sustained heat above 28°C
• Keep one side moist and one side drier

💧 Humidity and water

Moisture should be controlled rather than stagnant. Remove moldy food quickly, keep dry foods dry, and give moisture from safe foods or a small controlled damp area.

🌿 Enclosure and decoration

Use enough surface area and ventilation to prevent crowding, condensation, and odor. Keep cultures simple so dead animals, spoiled food, and mites can be spotted quickly. Clean small holding tubs between batches and refresh long-term cultures before they collapse.

🪳 Feeding

Useful foods:

• Leaf litter and decayed hardwood
• Vegetable scraps in small portions
• Cuttlefish bone, limestone, or calcium powder source

Feed the culture mainly with leaf litter and decayed hardwood, then add small pieces of vegetables and a constant calcium source. If animals will be used as feeders, harvest from a clean, pesticide-free culture rather than trying to gut-load them at the last minute.

🥚 Breeding

Females brood young in a marsupium, so there are no eggs to incubate separately. Stable moisture, leaf litter, and calcium produce steady colony growth, but very wet stagnant substrate causes losses.

Do not let breeding goals override feeder quality. Cultures that smell sour, contain many dead animals, or show heavy mites should not be used for sensitive animals.

🩺 Common problems

Common problems:

• Mold from excess moisture or stale food
• Mites from damp waste and old cultures
• Escape through poor lids or oversized ventilation mesh
• Nutritional imbalance when one feeder is used alone
• Predator injury or impaction risk when feeders are oversized
• Culture crashes from heat, crowding, pesticides, or contamination

📌 Conclusion

This species is most useful as a cleanup animal and occasional feeder when the colony is clean, calcium-rich, and not overharvested. The common failure is a sealed, wet box with too much fresh food and too little ventilation.

📚 Sources and further reading

• GBIF taxonomy: Armadillidium vulgare
• CITES Appendices
• European Commission: invasive alien species