The Woodlouse may look like an insect, but in fact it’s a crustacean and is related to the crab and the lobster. It’s thought there are about 3,500 species of woodlice in the world, and 35 to 40 of these can be found in the British Isles. Woodlice are sometime called Pill Bugs and Slater’s. The Pill woodlouse gets its name because it can roll itself up into a ball. Woodlice like damp, dark places and can be found hiding in walls, under stones and in compost heaps. Some species such as the common sea slater are only found on the coast. A woodlouse has 14 legs and an outer shell called an exoskeleton. When a woodlouse grows too big for its exoskeleton it has to molt to allow a new shell to take its place. Molting takes place in two stages, first the back half is shed and a day or so later the front half falls off. They have a pair of antennae to help them find their way around, and two small ‘tubes’, called uropod’s, sticking out of the back of their bodies. The uropod’s help them navigate and some species use them to produce chemicals to discourage predators. Most woodlice are found on land, but their ancestors used to live in water and breathe using gills. Woodlice eat rotting plants, fungi and their own faeces, but they don’t pee. They get rid of their waste by producing strong-smelling chemical called ammonia, which passes out through their shells as a gas. After mating, females carry their fertilised eggs in a small brood pouch under their bodies. The young hatch inside the pouch and stay there until they are big enough to survive on their own. A common woodlouse can live for three to four years. Apart from man, its main predators are centipedes, toads, shrews and spiders.