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PEST LIBRARY
About Pill Bugs
The little gray armored bugs that roll into a ball when you touch them, then turn up dead on the basement floor. Here is what pill bugs actually are, why they crowd in when the ground gets damp, and how to tell them from their lookalike.
FIELD NOTES
Pill Bugs by the Numbers
If they are gathering by the dozen in the damp corners of your home, here is what you are actually dealing with, and why it is nothing to worry about.
14
Legs
Seven pairs, one to a segment. More crustacean than insect.
0
Bites or Stings
They cannot bite, sting, or pass on disease. Completely harmless to people and pets.
1-2 days
Survival Indoors
Too dry inside to live. The ones that wander in dry out within a day or two.
Crustacean
Not an Insect
A land-living cousin of crabs, shrimp, and crayfish that breathes through gill-like structures.
TELL THEM APART
Pill Bug or Sow Bug?
Pill bugs get confused with sow bugs constantly. They are close relatives, look nearly identical, and both are harmless. There is one reliable way to tell them apart, and it is the trick every kid already knows.
ROLLS UP
Pill Bug
The roly-poly
Rolls into a ball No tails Rounded back
Touch one and it curls into a tight, perfect ball, which is where the roly-poly name comes from. Pill bugs have a rounded, armored back and no visible tails. They keep to damp ground, eat decaying plant matter, and are completely harmless.
STAYS FLAT
Sow Bug
The flat one
Cannot roll up Two tails Flatter body
The sow bug looks almost the same but cannot roll into a ball, and it has two short tail-like points off the back end. It lives in the same damp places and is just as harmless. If it rolls, it is a pill bug; if it stays flat with little tails, it is a sow bug.
WHY THEY APPEAR
Why Pill Bugs Crowd In When It Gets Damp
Pill bugs breathe through gill-like structures that have to stay moist, so they live and die by how damp the ground is. Most of the time they stay outdoors in soil and leaf litter, feeding on decaying plant matter. The trouble starts when the dampest ground on the property happens to be right against your house.
When the band of soil along the foundation stays wet, pill bugs collect there in large numbers, and a share of them push inside through whatever gaps they find. They cannot survive the dry air indoors, so they do not stay, but during a damp stretch the trickle is constant. These are the conditions that gather them at the foundation.
Damp Mulch Beds
Mulch banked against the foundation traps moisture and gives pill bugs a cool, wet place to gather right beside the house.
Overwatered Beds
Sprinklers and flowerbeds that stay saturated keep the foundation soil wet, which is exactly the habitat pill bugs need.
Leaf Litter and Debris
Leaves, grass clippings, and yard debris hold damp underneath and feed the decaying matter pill bugs eat.
Stones and Woodpiles
Pavers, landscape stones, planters, and stacked wood all trap moisture against the ground and shelter pill bugs by the dozen.
PEST THREAT LEVEL
1/10
LOW
Harmless, and Actually Useful
Pill bugs are about as harmless as a household pest gets. They do not bite, sting, or carry disease, and they cannot damage your home, your food, or your belongings. Outdoors they are genuinely useful: as detritivores they break down dead leaves and plant matter and help recycle nutrients back into the soil. A garden is better off with them than without.
The only mark against them is the occasional nibble on a tender seedling or a soft, low-hanging fruit in the garden, and even that is minor. Indoors they do nothing at all except wander in, fail to find moisture, and die. The whole problem is how they look in numbers, not anything they actually do.
No Bite or Sting
Harmless to people and pets
No Disease
Not a vector for illness
No Home Damage
Cannot harm your house
Helpful Decomposer
Recycles nutrients in soil
FREQUENTLY ASKED
Common Pill Bug Questions
The questions that come up every time pill bugs start gathering. Straight answers.
Are pill bugs dangerous?
No. They do not bite, sting, or carry disease, and they cannot harm your home. They are one of the most harmless creatures you will ever find indoors. The only thing they damage is the occasional seedling in a garden.
Are pill bugs insects?
No, and this surprises people. Pill bugs are crustaceans, more closely related to shrimp and crabs than to insects. They are one of the few crustaceans that live their whole lives on land, which is why they need constant moisture to breathe.
Why do they roll into a ball?
It is a defense. Rolling into a tight ball shields their soft underside and legs and helps them hold in moisture. That same trick is the easiest way to tell a pill bug from a sow bug, which cannot roll up.
Will they survive inside my house?
No. Indoor air is far too dry for an animal that breathes through gills. The ones that get in dry out and die within a day or two, which is why you find them curled up dead rather than thriving.
How do I keep them out?
Cut the moisture at the foundation: pull mulch back from the house, fix drainage and overwatering, clear leaf litter and debris, and seal gaps under doors and around basement windows. Dry ground and sealed entry points are what keep them out.
Pill Bugs Taking Over the Foundation?
Knowing why pill bugs are gathering, and where they are slipping in, is the difference between fighting them every damp stretch and breaking the cycle. The work is drying out and sealing the band around the house, not treating the open yard.
We have served Castle Rock, Parker, and Douglas County for over 13 years. We find the moisture and entry points, treat the band where they cross, and keep the perimeter sealed.
Call 720-583-4126 or contact us online to get started.
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