Millipedes are nocturnal. They are active from spring to fall and reproduce in summer. They overwinter in a sheltered place.
When millipedes hatch, they have only three pairs of legs. The number increases with each succeeding moult.
They move slowly, but have a number of defences. First of all, they have a rigid exoskeleton, and roll up in a ball to protect their vulnerable parts. They can also secrete a foul-smelling yellowish-brown liquid. Lastly, they can dig into the soil to hide themselves.