Nick Upton / Southern pill woodlouse (Armadillidium depressum) on an old garden wall at night, Wiltshire, UK, September.

Nick Upton / Two Southern pill woodlice (Armadillidium depressum) on an old garden wall at night, Wiltshire, UK, September.

Nick Upton / Southern pill woodlouse (Armadillidium depressum) on an old garden wall at night, Wiltshire, UK, September.

MYN / Dirk Funhoff / Woodlouse (Armadillidium vulgare) upside down, Staudernheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Woodlouse (Armadillidium vulgare) shpwing underside, Staudernheim, Germany. Meetyourneighbours.net project.

MYN / Dirk Funhoff / Woodlouse (Armadillidium vulgare), Staudernheim, Pfalz, Germany. September. Meetyourneighbours.net project

Solvin Zankl / Woodlouse (Armadillidium pulchellum) Niedersechsische Elbtalaue Biosphere Reserve, Elbe Valley, Lower Saxony, Germany, December.

Pascal Pittorino / Woodlouse (Armadillium vulgare) on wood, Var, Provence, France, July.

MYN / Eduardo Blanco / Woodlouse (Armadillidium sp), Corella, Navarra, Spain, April. meetyourneighbours.net project

Stephen Dalton / Close up of a pill woodlouse (Armadillidium vulgare) curled up, UK.

MYN / Marc Pihet / Pill woodlouse (Armadillidium vulgare) Maine-et-Loire, France, August, meetyourneighbours.net project

MYN / Dimitris Poursanidis / Woodlouse (Armadillidium granulatum) Heraklion, Crete, Greece meetyourneighbours.net project

MYN / Matt Cole / Pill woodlouse (Armadillidium vulgare), Leicestershire, England, UK, March. meetyourneighbours.net project

Juergen Freund / Pill bug (Armadillidium sp) curled into a ball, Tanjung Puting National Park, Borneo, Central Kalimantan, Indonesia

Juergen Freund / Pill bug (Armadillidium sp) on forest floor, Tanjung Puting National Park, Borneo, Central Kalimantan, Indonesia

Juergen Freund / Pill bug (Armadillidium sp) on forest floor, Tanjung Puting National Park, Borneo, Central Kalimantan, Indonesia

Juergen Freund / Pill bug (Armadillidium sp) rolled into ball, on forest floor, Tanjung Puting National Park, Borneo, Central Kalimantan, Indonesia

Niall Benvie / Composite of insects, arachnids and plants found on the Arnos Vale BioBlitz, Bristol, UK, June 2012 meetyourneighbours.net project. Orange ladybird (Halyzia sedecimguttata), Ivy (Hedera helix), Green...

MYN / Jerry Monkman / Pill bug / Pill woodlouse (Armadillidium vulgare) Rye, New Hampshire, USA, September. meetyourneighbours.net project

Nature Production / Common pill bug / woodlouse (Armadillidium vulgare) rolled up in ball, on white background, Japan

Nature Production / Common pill bug / woodlouse (Armadillidium vulgare) lying on its back, on white background, Japan

Nature Production / Common pill bug / woodlouse (Armadillidium vulgare) on white background, Japan

Nature Production / Common pill bug / woodlouse (Armadillidium vulgare) on white background, Japan

Nature Production / Common pill bug / woodlouse (Armadillidium vulgare) on white background, Japan

Simon Colmer / Pill woodlouse (Armadillidium vulgare) uncurling sequence on white background Sussex, UK. Digital composite

Simon Colmer / Pill woodlouse (Armadillidium vulgare) curled in ball, Sussex, UK, March

Simon Colmer / Pill woodlouse (Armadillidium vulgare) portrait, Sussex, UK, March

Piotr Naskrecki / Pillbug (Armadillidium sp), Woburn, Massachusetts

Piotr Naskrecki / Pillbug (Armadillidium sp) on its back, Woburn, Massachusetts

Nature Production / Pillbug / Pill Woodlouse {Armadillidium vulgare} shedding skin, sequence 3/3, Tokyo, Japan

Nature Production / Pillbug / Pill Woodlouse {Armadillidium vulgare} first moult after hatching, Tokyo, Japan

Nature Production / Pillbug / Pill Woodlouse {Armadillidium vulgare} shedding skin, sequence 2/3, Tokyo, Japan

Nature Production / Pillbug / Pill Woodlouse {Armadillidium vulgare} shedding skin, sequence 1/3, Tokyo, Japan

Ingo Arndt / Common Pillbug (Armadillidium vulgare) pair rolled into defensive balls, Europe

Pete Oxford / Common Pillbug (Armadillidium vulgare) group dried for sale in traditional medicine market, Yunnan, China

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) baby, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) pair feeding on leaf, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) peeking through a leaf hole, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) pair climbing on garden plants, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult climbing on plant, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) pair of babies with one rolled up into a ball, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult portrait, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolled into protective ball, worldwide distribution, sequence 3 of 3

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolling into protective ball, worldwide distribution, sequence 1 of 3

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolling into protective ball, worldwide distribution, sequence 2 of 3

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) group of four various ages, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolled into protective ball, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult backside, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) feeding on leaf, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) rolling into a ball beside a toy replica, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) balancing on string, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) interacting with a toy replica, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) atop a toy replica, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) droppings, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult being eaten by lizard, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult being eaten by lizard, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) juvenile touching a young individual known as a manca that is rolling into a protective ball, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult portrait, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) living on the underside of leaves, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) feeding on leaf, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) pair climbing on pencils, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) five collected in a glass, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) balancing on string, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) female showing brood pouch full of young, called manca, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) juvenile touching a young individual known as a manca that is rolling into a protective ball, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) three young, called manca, recently emerged from mother's brood pouch, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) juvenile touching a young individual called a manca, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult with young individual called a manca in moss, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult, juvenile and young before rolling into protective balls, worldwide distribution, sequence 1 of 2

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult, juvenile and young rolled into protective balls, worldwide distribution, sequence 2 of 2

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) mother with young called manca in brood pouch, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) mother and young called manca recently emerged from mother's brood pouch, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) mother and young called manca recently emerged from mother's brood pouch, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) mother and young called manca recently emerged from mother's brood pouch, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) mother and young called manca recently emerged from mother's brood pouch, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) three young, called manca, recently emerged from mother's brood pouch, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) adult rolled into protective ball, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) pair of adults in garden, worldwide distribution

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) pair of babies, one responding to touch by rolling into a protective ball, worldwide distribution

Jane Burton / Pill Woodlouse {Armadillidium} ventral view.

Kim Taylor / Pill woodlouse {Armadillidium sp}

Kim Taylor / Pill woodlouse {Armadillidium sp}

Kim Taylor / Pill woodlouse {Armadillidium sp} unrolling and walking off. Digital composite.

Philip Dalton / Pill Woodlouse (Armadillidium vulgare) opening from defensive ball, UK.

Philip Dalton / Pill Woodlouse (Armadillidium vulgare) Rolled up in defensive ball, UK.

Philip Dalton / Pill Woodlouse (Armadillidium vulgare) Rolled up on dfensive ball, UK. Articulated skin plates - armour

Philip Dalton / Pill Woodlouse (Armadillidium vulgare) Rolled up on in defenisve ball, UK. Articulated skin plates - armour

Philip Dalton / Pill Woodlouse (Armadillidium vulgare) Rolled up on leaf, UK. Articulated skin plates - arnmour

Philip Dalton / Pill Woodlouse (Armadillidium vulgare) rolled up in defensive ball, UK. Articulated skin plates - armour

Philip Dalton / Pill Woodlouse (Armadillidium vulgare) Rolled up in defensive ball, UK. Articulated skin plates - armour

Philip Dalton / Pill Woodlouse (Armadillidium vulgare) Rolled up in defensive ball, UK. Articulated skin plates - armour

Kim Taylor / Pill woodlouse {Armadillidium cinerum} portrait, UK.

Mitsuhiko Imamori / Japanese Tree Frog (Hyla japonica) eating a Common Pillbug (Armadillidium vulgare), Shiga, Japan

Nature Production / Pillbug / Pill Woodlouse {Armadillidium vulgare} feeding on nut, Japan

Mitsuhiko Imamori / Common Pillbug (Armadillidium vulgare) garden habitat, worldwide distribution