Armadillidiidae

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Armadillidiidae is a family of woodlice in the order Isopoda. Members of the family are commonly known as pill bugs or roly-polies. They are distinguished from other woodlouse families by features including a two-segmented antennal flagellum, the form of the uropods, and their ability to roll the body into a ball. This rolling behaviour, known as conglobation, is used as a defence against predators and can also reduce water loss. Similar behaviour evolved independently in several other animal groups, including the outwardly similar pill millipedes. Armadillidiids typically inhabit cool, damp and shaded places with decaying organic matter. Their diet consists largely of decomposing plant material, although they may also feed on living plants and other organic matter; some can become agricultural pests under favourable conditions.

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