Tachypodoiulus niger, more commonly known as the white-legged snake millipede or the black millipede, is a European species of millipede, found in chalky soil in the UK, Ireland and many European countries.  Found in compost heaps and under stones in gardens, the White-legged snake millipede is a common minibeast.

The White-legged snake millipede has a shiny black, long, cylindrical body and contrasting white legs. Millipedes have two pairs of legs per segment of their body, whereas similar centipedes have one. The White-legged snake millipede has about 100 legs. There are many millipede species in the UK, which can be difficult to tell apart.

 Despite its name, it has about 100 legs, measuring up to 6cm in length and is found year-round.  It is an important recycler of nutrients, feeding on decaying matter, living in leaf litter, under bark and in mossy areas.  They are vegetarians, eating mildew and decaying vegetation, and perform a useful nutrient-recycling function in various habitats.

The millipede is most active after dark, from just before sunset to just before sunrise.   Its natural predators are other centipedes and hedgehogs.  So as a defence mechanism they can round into coil like spiral, so protecting its underbelly and head, it can also rapidly flee using a sidewinding movement and is able release a pungent fluid from its sides to deter predators.