Do any species of pill bug feed on other insects?

 Pill bugs—also called roly-polies, woodlice, or Armadillidiidae—are terrestrial isopods, and they are not insects, but crustaceans. While most species are known as detritivores (feeding on decaying plant material), here's what we know about their feeding behavior, especially regarding other insects:

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🔍 Do Pill Bugs Feed on Other Insects?

Not usually.
Most pill bugs are scavengers, not predators. They do not hunt or actively feed on live insects, but they might consume dead insects as part of their scavenging diet.

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🪱 When Do Pill Bugs Interact with Insects?

1. Scavenging Dead Insects

   • Pill bugs have been observed eating the decomposing bodies of insects, especially in moist environments.

   • This is opportunistic and not their primary food source.

2. Occasional Soft Tissue Feeding

   • In rare cases, pill bugs may nibble soft tissues of sick or injured insects (e.g., molting insects or larvae), especially in confined terrariums or pet enclosures where food is limited.

   • This is still more scavenging than true predation.

3. In Decomposing Environments

   • In compost piles or decaying leaf litter, pill bugs might share space with insect larvae but aren’t likely to feed on them unless they’re already dead or dying.

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❌ Not Predators

• Pill bugs lack the adaptations for hunting—no fangs, venom, or fast movement.

• They rely on mouthparts for scraping and chewing, not piercing or catching.

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✅ What They Prefer to Eat

• Decaying leaves

• Rotting wood

• Fungi

• Algae

• Dead plant matter

• Occasionally: dead insects or animal waste

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Summary

Behavior	Pill Bug Response
Eat dead insects	✅ Occasionally
Hunt live insects	❌ No
Attack weak larvae	⚠️ Rarely, under special conditions
Prefer decaying plants	✅ Always