its a MILLIPEDE

via The Age

Victorian homes are being invaded by black Portuguese millipedes revelling in ideal conditions created by recent rains.

He said the millipedes, which are smooth and cylindrical and between 2-4.5cm long, secreted the chemical hydrogen cyanide when they were disturbed or squashed.

While not dangerous to humans in small quantities, the chemical stains anything it comes into contact with and is extremely irritating to eyes.

"The best thing to do is to not squish them. If you can, sweep them up and put them outside. They actually don't like being inside and certainly don't breed inside but they come inside because often there's just so many of them."