Millipedes are not venomous. They do not inject venom with fangs, stingers or claws. Some species do release defensive chemicals when disturbed, though, and those secretions can irritate skin, eyes or mucous membranes.

That is the key distinction. Venomous means an animal delivers venom actively, usually by biting or stinging. Poisonous is a broader term for animals that can cause harm if touched or eaten. With millipedes, the more accurate description is that some species produce defensive secretions.

Are millipedes poisonous or venomous?

Millipedes defend themselves in simple ways rather than with venom. When disturbed, many will curl up, stay still or release a defensive fluid from their body. This is not an injection, and it is not the same thing as venom.

For people, the usual risk is temporary irritation rather than serious harm, although care should still be taken to avoid contact with the eyes or mouth.

Why the topic matters

People often ask whether millipedes are dangerous because they look unusual and may be found in numbers under logs or in leaf litter. In reality, they are generally shy animals that prefer to avoid contact.

For keepers, the main point is safe handling. Millipedes are best handled gently and briefly, with hands washed afterwards. If you want practical advice, see our How to Handle a Millipede Safely guide.

Useful context

Millipedes are ground-dwelling detritivores, feeding on decaying plant material in leaf litter, soil and rotting wood. That is why they are often associated with damp, sheltered places and why they may curl up, hide or burrow when disturbed.

Not every species responds in exactly the same way. Some are more likely to produce defensive secretions than others, and the strength of that defence can vary. If you want to understand the chemistry behind it, read Why Do Some Millipedes Produce Defensive Secretions?

What to do if a millipede releases secretions

If a millipede produces a defensive fluid, wash any contacted skin with soap and water and avoid rubbing your eyes or face. If secretion gets into the eyes, rinse thoroughly with clean water. If irritation continues, seek medical advice.

Millipedes are better suited to watching than frequent handling. Their value is in their natural behaviour: burrowing, feeding and moving through the substrate when conditions suit them.

Do millipedes bite?

In normal keeper terms, no. Millipedes are not built to bite people in a dangerous way. The real caution is their defensive secretions, not bites or venom.

So, are millipedes poisonous or venomous? Millipedes are not venomous. Some species can be mildly irritating because of the chemicals they release, but they do not pose the same kind of risk as venomous animals.