Bad – The Black Portuguese millipede is an herbivorous (plant eater) millipede native to Portugal. This species was accidentally introduced into Australia, first recorded in WA in 1986, where it has since become an invasive pest. Lacking natural predators in Australia, the black Portuguese millipede has thrived to ‘plague’ proportions. They have been known to enter residences due to their sheer numbers.
As a defense mechanism, the millipede secretes a pungent yellowish fluid containing hydrogen cyanide which irritates eyes and stains clothes permanently. Due to this defence mechanism, it is advised that people sweep them up rather than crushing them.