If you’ve spent much time hiking in the Upstate, you’ve probably seen one slowly making its way across a trail, a rock, or a fallen log. Some people mistake them for giant worms, while others assume they’re dangerous because they have so many legs.
The truth is, millipedes are some of the most beneficial creatures living in our forests.
The colorful visitor pictured above is a flat-backed millipede, a common resident of the hardwood forests found throughout the Upstate and the southern Appalachian Mountains. While they may look intimidating at first glance, these gentle animals spend their lives performing one of nature’s most important jobs—cleaning up the forest floor.
Not a Centipede!
One of the biggest misconceptions is that millipedes and centipedes are the same thing.
They’re actually very different.
| Millipedes | Centipedes |
|---|---|
| Slow-moving | Fast-moving |
| Feed on dead leaves and wood | Hunt insects and spiders |
| Cannot bite people | Some species can deliver a painful bite |
| Rounded or flattened body | Flatter body with long legs extending outward |
| Two pairs of legs on most body segments | One pair of legs on each body segment |
An easy way to tell them apart is by watching how they move. Millipedes crawl slowly, almost like tiny living tanks, while centipedes dart across the ground at surprising speed.
Nature’s Recycling Crew
Millipedes are decomposers.
Rather than hunting prey, they spend their lives eating:
- Dead leaves
- Rotten wood
- Moss
- Fungi
- Other decaying plant material
As they feed, they break down this organic material into nutrients that return to the soil. Without creatures like millipedes, forests would quickly become buried beneath layers of dead leaves and fallen branches.
Every healthy Appalachian forest depends on decomposers like these.
Why Are They So Colorful?
The millipede in the photo has striking pinkish-red edges along each body segment.
Bright colors in nature often serve as a warning.
Millipedes don’t have venom or powerful jaws, but many species produce defensive chemicals when threatened. These chemicals discourage birds, raccoons, and other predators from eating them.
The secretion is generally harmless to people, though it can irritate sensitive skin or eyes. If you happen to pick one up, simply wash your hands afterward.
Do They Really Have a Thousand Legs?
Surprisingly…
No.
The name “millipede” comes from Latin and means “thousand feet,” but no known species actually has 1,000 legs.
Most millipedes have somewhere between 80 and 400 legs, although the exact number varies by species and age.
As they grow, they add new body segments—and with them, more legs.
Where Can You Find Them?
Millipedes love cool, damp environments.
In the Upstate, you’re most likely to spot them:
- Along shaded hiking trails
- Under logs
- Beneath rocks
- In leaf litter
- Near streams and waterfalls
- After a rainstorm
They’re especially common in mountain forests where moisture remains high throughout the summer.
Are They Dangerous?
Not at all.
Millipedes are among the most harmless animals you’ll encounter on a hike.
They:
✔ Don’t bite.
✔ Don’t sting.
✔ Don’t chase people.
✔ Don’t damage gardens or healthy plants.
When frightened, they’ll usually curl into a tight spiral to protect their softer underside.
A Living Fossil
Millipedes are incredibly ancient.
Their ancestors were crawling across the Earth more than 400 million years ago, making them some of the earliest animals to live on land.
They were already wandering forests long before dinosaurs appeared.
Some prehistoric millipedes grew more than six feet long, making them the largest land-dwelling arthropods ever known.
Thankfully, today’s Upstate species usually reach only two to four inches in length.
Why You Should Appreciate Them
Millipedes rarely receive much attention because they aren’t flashy or fast.
Yet every one of them quietly helps keep our forests healthy.
Without decomposers like millipedes, leaves would pile up year after year, nutrients wouldn’t be recycled efficiently, and the rich forest soils that support our trees and wildflowers wouldn’t exist.
The next time you see one crossing the trail, take a moment to appreciate this tiny cleanup crew member. It may not be the most glamorous creature in the woods, but it’s one of the hardest-working.
Did You Know?
- Millipedes have been living on Earth for over 400 million years.
- Most species are active at night or during cool, damp weather.
- They breathe through tiny openings called spiracles located along the sides of their bodies.
- Millipedes can regenerate some lost legs after molting.
- South Carolina is home to dozens of different millipede species.
- The largest known millipede in the world can grow to nearly 15 inches long.
Have you spotted a millipede on one of your Upstate adventures?
Share your photos in the comments and let us know where you found them. You may inspire someone else to take a closer look at one of the forest’s most overlooked—and most important—residents.
