Cyril Ruoso / Pill millipede (Glomeris sp) Gunung Leuser NP, Sumatra, Indonesia.

MYN / Joris van Alphen / Pill millipede (Glomeris connexa) curled into defensive ball, Crocker Range, Borneo, Malaysia. Meetyourneighbours.net project

Cyril Ruoso / Pill Millipede (Glomeris sp) rolled up in defensive position, Gunung Leuser National Park, Sumatra, Indonesia

Cyril Ruoso / Pill Millipede (Glomeris sp) rolled into a protective ball, Kalimantan, Indonesia

MYN / Denis Palanque / Pill millipede (Glomeris marginata) woodland, Savoie, France, June. meetyourneighbours.net project

MYN / Denis Palanque / Pill millipede (Glomeris marginata) rolled up for defence, woodland, Savoie, France, June. meetyourneighbours.net project

Simon Colmer / Pill Millipede (Glomeris marginata) walking, Sussex, UK, June

Simon Colmer / Pill Millipede (Glomeris marginata) uncurling, Sussex, UK, June

Simon Colmer / Pill Millipede (Glomeris marginata) uncurling, Sussex, UK, June

Simon Colmer / Pill Millipede (Glomeris marginata) curled up for protection, Sussex, UK, June

PREMAPHOTOS / Pill millipede {Glomeris marginata} rolled up defensively, UK

PREMAPHOTOS / Pill millipede {Glomeris marginata} rolled up defensively, UK

Doug Gimesy / Frilled-neck lizard (Chlamydosaurus kingii) on Australian 2 cent coin, no longer in circulation. Designed and sculpted by Stuart Devlin.

Doug Gimesy / Echidna (Tachyglossidae aculeatus) on Australian 5 cent coin. 2019.

Doug Gimesy / Platypus (Ornithorhynchus anatinus) on Australian 20 cent coin. Designed and sculpted by Stuart Devlin. 2019.

Doug Gimesy / Platypus (Ornithorhynchus anatinus) on Australian 20 cent coin, black background. Coin designed and sculpted by Stuart Devlin. 2019

Robin Chittenden / Sand crocus (Romulea columnae) with coin for scale, Dawlish Warren National Nature Reserve, Devon, UK. April.

Phil Savoie / Fishing hook #28 hook, the smallest available hook, 4mm in average size to imitate the Tiny blue wing olive mayfly (Pseudocloeon sp.) seen in centre of the penny, Bozeman, Montana, USA.

Phil Savoie / Tiny blue wing olive (Acentrella turbida) on US penny, Bozeman, Montana, USA. August.

Juan Carlos Munoz / Banknotes of Costa Rica showing illustrations of Costa Rican animals including Sloths, Capuchins and Sharks. December 2014.

Gavin Hellier / Euro Tower, home of European Central Bank, and Euro Symbol, Willy Brandt Platz, Frankfurt, Hessen, Germany 2010

Gavin Hellier / Euro Tower, home of European Central Bank, and Euro Symbol, Willy Brandt Platz, Frankfurt, Hessen, Germany 2010

Gavin Hellier / Neon signs in shape of foreign currencies, Tsim Sha Tsui, Kowloon, Hong Kong, China 2007

Wild Wonders of Europe / Widstrand / Romanian 50 lei bill, with eagle, from 2011