Also known as: Potato Bug, Common Pill Woodlouse, Roly-Poly, Doodle Bug, Carpenter, Pill Bug, Pill Woodlouse, Common Pillbug
Scientific name: Armadillidium vulgare.
Armadillidium vulgare may reach a length of 18 millimetres (0.71 in), and is capable of rolling into a ball when disturbed; this ability, along with its general appearance, gives it the name pill-bug and also creates the potential for confusion with pill millipedes such as Glomeris marginata. It can be distinguished from Armadillidium nasatum and Armadillidium depressum, the only other British species in the genus, by the gap that A. nasatum and A. depressum leave when rolling into a ball; A. vulgare does not leave such a gap.
Difference between a Pillbug/Roly poly/woodlouse (Armadillidium vulgare, a terrestrial crustacean) and a pill millipede (Glomeris marginata, a myriapod) via @gifophunia. Follow, like and reblog!