Millipedes usually move out of their normal habitat before the colder months. They’re attracted to light, and at night may enter your home, with their distinctive smell and stains, they can be very unpleasant.
The black Portuguese millipede (Ommatoiulus moreletii) was accidently introduced into Australia where, due to the lack of natural predation, has become an invasive pest and multiplied to plague proportions.
Black Portuguese millipedes hatch from eggs in the soil & are generally found in moist conditions where they feed on rotting vegetation. They are active at night and during hot dry conditions they will remain hidden in the soil. As a defense mechanism, millipedes will secrete a pungent yellowish fluid that stains clothes and irritates eyes. As a result it is more practical to sweep up millipedes rather than squash them.
Chemical and physical barriers are even traps are the most common ways of preventing millipedes from entering the home.