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It’s a common backyard mystery: a long, many-legged creature appears in the garden or the basement. Are you looking at a harmless millipede or a faster, potentially bite-capable centipede? Knowing which is which can calm nerves and guide your response. Below, learn simple, practical ways to tell them apart, how and why they enter homes, and when to handle them yourself versus calling a pro.
Quick visual clues to tell centipedes from millipedes
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Body shape, leg pattern, and movement
- Centipedes are flattened and agile. They have one pair of legs per body segment and run quickly.
- Millipedes appear rounder and move slowly. Each body segment bears two pairs of legs that create a rippling gait.
- Centipedes often have long antennae and a visible head with distinct jaws. Millipedes lack prominent jaws and can curl into a coil when alarmed.
Color and size differences
- Millipedes commonly show browns, reddish browns, or black tones and are usually a few inches or less.
- Centipedes vary more in length and color. Some species range from an inch to nearly a foot in extreme cases, and may be brown, reddish, or pale yellow.
- Leg count is not a reliable way to identify species by number alone. Look at leg pairs per segment and overall body shape instead.
Why these critters venture indoors
Both groups prefer humid, sheltered spots. They thrive in leaf litter, mulch, and damp soil. When weather turns dry or cold, they may wander inside seeking moisture and refuge.
- Millipedes typically enter accidentally while following decaying plant matter. They feed on decomposing leaves and roots.
- Centipedes are predators that pursue insects. Finding many centipedes indoors often points to an indoor insect population they feed on.
- Common entry points include foundation cracks, gaps around doors and windows, and openings near plumbing.
Safe handling and removal at home
Most encounters are more startling than dangerous. Still, a cautious approach reduces risk and limits mess.
- If you find a millipede, you can gently scoop it into a container and release it outside. Wear gloves if you plan to touch one.
- Millipedes can emit defensive fluids. These secretions may stain surfaces and irritate skin in rare cases.
- For centipedes, avoid barehanded contact. Use a jar or long-handled tool and gloves. Small house centipedes rarely bite people.
- Larger outdoor centipedes can deliver painful bites similar to a bee sting. Seek medical advice if swelling or strong reactions occur.
Houseproofing: simple steps to reduce encounters
Preventing infestations focuses on two goals: deny entry and remove attractants. Small changes make a big difference.
- Seal gaps: caulk foundation cracks and weatherstrip doors and windows.
- Reduce moisture: run dehumidifiers in basements, fix leaky pipes, and ensure good ventilation in bathrooms.
- Remove shelter: keep wood piles, leaf litter, and mulch away from home walls.
- Control other pests: reducing roaches, silverfish, and other insects limits centipede food sources.
When to call pest control
Most single sightings don’t require professional help. Consider a pro when the problem is recurring or widespread.
- Large numbers indoors over several days suggest an underlying infestation.
- If household members have allergic reactions to bites or secretions, seek expert removal.
- Homes with persistent moisture issues or hard-to-seal foundations may need targeted treatments.
Practical field tips for identification
- Observe movement: fast, darting, and flattened equals likely centipede.
- If the creature curls into a tight coil, it’s almost certainly a millipede.
- Photograph before touching. A clear photo helps pest professionals identify the species.
- Keep kids and pets away until you know which creature you’re dealing with.
