Sergio Hanquet / Green sea turtle (Chelonia mydas), two viewed from above. Tenerife, Canary Islands.

Fred Olivier / Tawny hermit crab (Coenobita rugosus) emerging from its shell, Christmas Island, Indian Ocean, Australian Territory.

Philippe Clement / Lined top shells (Phorcus lineatus) in a rock pool, Normandy, France, June

Philippe Clement / Lined top shells (Phorcus lineatus) and Common european limpets (Patella vulgata) in a rock pool, Normandy, France, June.

Steve Downer / Juvenile Common frog (Rana temporaria) on back of a Common snail (Cornu aspersum), UK, June.

Steve Downer / Juvenile Common frog (Rana temporaria) on back of a Common snail (Cornu aspersum), UK, June.

Dave Bevan / Two Giant african snails (Achatina fulica) emerging from their shells and looking around, UK. Captive.

Ingo Arndt / Land snails (Polymita picta) shells, Cuba. Endemic species.

Ingo Arndt / Land snail (Polymita picta) collection of shells showing variation in patterning, Cuba. Endemic species.

Pedro Narra / Green turtle (Chelonia mydas) resting in the shallows of the coast, Bijagos Islands, Guinea Bissau. Endangered species.

Pedro Narra / Shell of Green Turtle (Chelonia mydas) outside mud house, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the...

Pedro Narra / Green Turtle (Chelonia mydas) returning to sea, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of the Terre Sau...

Wild Wonders of Europe / Zankl / Loggerhead sea turtle (Caretta caretta) emerging from shell, Dalyan delta, Turkey, July.

Enrique Lopez-Tapia / Hamer women in traditional clothing at the Jumping of the bulls ceremony. Ethiopia, November 2014

Georgette Douwma / Green turtle (Chelonia mydas) with two large remoras (Echeneis naucrates) attached to its carapace, at rest on artificial reef. Mabul, Malaysia.

Jurgen Freund / Chambered nautilus (Nautilus pompilius) with red whip coral. Osprey Reef, Great Barrier Reef, Queensland, Australia.

MYN / Gil Wizen / Israeli sand cockroach (Heterogamodes hebraica) composite showing ventral and dorsal view of female, Central Coastal Plain, Israel, April. Focus-stacked. meetyourneighbours.net project

Stephen Dalton / Close-up of a shell, UK.

MYN / Lily Kumpe / Composite of seashells from beach on Bali, Indonesia. Meetyourneighbtous.net project

Olga Kamenskaya / Snails (Baicalia turriformis) Lake Baikal, Russia, August.

Ingo Arndt / Caddisfly (Limnephilus sp.) case built of sticks, wood fragments, seeds, snail shells and plant stems, Germany, November.

Philippe Clement / Fossils of belemnites and ammonites on shingle beach near Lyme Regis along the Jurassic Coast, Dorset, UK, November 2012

Philippe Clement / Ammonite fossils (Promicroceras planicosta) on shingle beach near Lyme Regis along the Jurassic Coast, Dorset, southern England, UK, November 2012

Sandra Bartocha / Sea shells in sand, North sea, Germany, September

Mark Hamblin / 2020VISION / Close-up of shells on tide line. Sandyhills Bay, Solway Firth, Dumfries and Galloway, Scotland, UK, February 2012.

Mark Hamblin / 2020VISION / Close-up of shells on tide line. Sandyhills Bay, Solway Firth, Dumfries and Galloway, Scotland, UK, February 2012.

Alex Mustard / 2020VISION / Mollusc shells washed up on a beach in the Cairns of Coll, Island of Coll, Inner Hebrides, Scotland, UK, North Atlantic Ocean, June 2011

MYN / Jerry Monkman / Acadian hermit crab (Pagurus acadianus) emerging from shell, Rye, New Hampshire, USA, January. meetyourneighbours.net project

Philippe Clement / Flat periwinkle (Littorina obtusata) shells on beach showing colour variations, Brittany, France

Philippe Clement / Common / Edible cockle (Cerastoderma / Cardium edule) shells on beach, Belgium

Alex Mustard / 2020VISION / Bed of Common mussels (Mytilus edulis) growing on rocks, feeding, Megavissey, Cornwall, UK, May.

Thomas Rabeil / Portrait of a Spurred Tortoise (Geochelone sulcata). Termit Massif, Niger, Africa.

Kim Taylor / Brown-lipped Banded Snail (Cepaea) against a white background. Surrey, UK, April.

Jurgen Freund / Green turtle (Chelonia mydas) swimming through the sea near a coral reef, seen from above. Sipadan Island, Semporna, Sabah, Malaysia, June

Alex Mustard / A young California sealion (Zalophus californianus) playing with a starfish, inside an underwater cave. The pups will pick up a variety of objects (such as starfish, lumps of coral, shells and feather...

Alex Mustard / A young California sealion (Zalophus californianus) playing with a starfish, inside an underwater cave. The pups will pick up a variety of objects (such as starfish, lumps of coral, shells and feather...

Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

Claudio Contreras / Pink abalone (Haliotis corrugata) shell detail, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, January

David Fleetham / Tiny eyes of Spider conch / Scorpion shell (Lambis scorpius) peering from underside of shell, Philippines.

Wild Wonders of Europe / Lilja / Snail shells on Crown daisy (Glebionis coronarium) flower, Kritsa, Crete, Greece, April 2009

Wild Wonders of Europe / della Ferrera / Hermann's / Dalmatian tortoise (Testudo hermanni hercegovinensis) near Svitava Lake, Hutovo Blato Nature Park, Bosnia and Herzegovina, May 2009

Wild Wonders of Europe / Maitland / Turkish / Balkan edible snail (Helix lucorum) on plant, Stenje region, Lake Macro Prespa, Galicica National Park, Macedonia, June 2009

Wild Wonders of Europe / Zupanc / White-lipped snail (Cepaea hortensis) on grass, Triglav National Park, Slovenia, June 2009

Sue Daly / Hawksbill turtle (Eretmochelys imbricata) with algal growth on carapace, Cebu, Philippines, March, Endangered species

Wild Wonders of Europe / Novák / Sand and shells, Japsand, Schleswig-Holstein Wadden Sea National Park, Germany, April 2009

Wild Wonders of Europe / Lundgren / Giant / King scallop (Pecten maximus) seabed covered in shells, Moere coastline, Norway, February 2009

Wild Wonders of Europe / Lundgren / Kelp with Common / Red sunstar (Crossaster papposus) and shells, Moere coastline, Norway, February 2009