These guys aren't little worms and can grow up to 20cm long. Around here they are a glossy black, but I see in my nature book that you also find some with alternating yellow and black bands. I also have not found that one so they probably occur somewhere else in the country. I've always wondered how many legs a millipede actually have, so I looked it up as well. Up to 120 pairs of legs. So shouldn't they be called a twohundredandfourtypede? The babies hatch with only three pairs of legs and acquire more at each moult.
This millipede I found somewhere on a walkway had became a meal to these red bugs. I can't find what they are, but they look like some kind of stinkbug (ja ok, so I just made that up).
Just some random interestingness connected to this topic. In South Africa there is a tourist train called the Shongololo Express named after these little animals.