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BiologyThis species feeds on dead organic matter (1); it tends to be active mainly at night, and shows a preference for humid areas, such as below logs and stones, to avoid desiccation. However, thanks to its ability to roll into a ball, it is much more tolerant of dry conditions than many other species of millipede (4). Males transfer sperm to females by means of heavily built, modified rear legs known as gonopods (3). Eggs are laid singly, and are coated in a protective layer of digested earth, secreted from the anus. It takes around 3 years for juveniles to reach maturity, during this time they progress through nine moults, and the adults then continue to moult periodically (4). British pill millipedes are known to have lived for as long as 11 years (3).