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.

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

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

Edwin Giesbers / Brown-lipped / Grove / Banded snails (Cepaea nemoralis) on plant stem, Menorca, Balearic Islands, Spain, Europe

Chris O'Reilly / Common snail {Helix aspersa} Adult on moss covered stone at night in rain, Garden, Autumn, Derbyshire, UK

Jabruson / Marsh mongoose {Atilax paludinosus} eating Snail in shell, Serengeti NP, Tanzania

Mike Wilkes / Song thrush {Turdus philomelos} breaking snail shell on anvil, St. Marys, Isles of Scilly, UK.

Mike Wilkes / Song thrush {Turdus philomelos} with snail shell, St. Marys, Isles of Scilly, UK.

Martin Gabriel / Rosy wolf snail shell in sand {Euglandia rosea} from Hawaii

Martin Gabriel / Golden apple snail {Pomacea canaliculata} shell.

PREMAPHOTOS / Dune snail bee {Osmia aurulenta} seals empty shell {Helix aspera} with leaf mastic for nest. UK

Norbert Wu / Cone Snail (Conus dalli), Sea of Cortez, Baja California, Mexico

PREMAPHOTOS / White lipped snails on moss (Cepaea hortensis) showing variation in pattern on shell within the species, UK.

Colin Varndell / Song thrush (Turdus philomelos) anvil with broken snail shells. Dorset, England, UK. April.

Gary Bell/ Oceanwide / Oriental Sundial (Architectonica perspectiva), Anilao, Philippines

Shane P. White / Small-leaved Fig (Ficus obliqua) trees along freshwater spring, Matevulu Blue Hole, Espiritu Santo, Vanuatu

Pascal Kobeh / Articulate harp shell (Harpa articularis) on the sand at night, Sulu Sea, Philippines

Nick Upton / Thick / Toothed top shell (Phorcus lineatus), five exposed on rock at low tide. Cornwall, England, UK. September.

Nick Upton / Painted topshell (Calliostoma zizyphinum) on Kelp frond in rockpool on low shore. Near Falmouth, Cornwall, England, UK. September.

Nick Upton / Dog whelk (Nucella lapillus) from Atlantic Ocean. Cornwall, England, UK. September.

David Fleetham / Sea snail (Thyca crystallina), two growing on host Blue sea star (Linckia laevigata). Philippines.

David Fleetham / Auger shell (Terebridae) eye to eye with Skeleton shrimp (Caprellidae sp), close-up. Blurry areas in the background where freshwater is percolating up through sand and mixing with saltwater. Philippin...

David Fleetham / Cone shell (Conus sp) gliding across sand at night with two Mysid shrimps (Mysida sp) hitching a ride. Dumaguete, Philippines.

David Fleetham / Triton sea snail (Colubraria sp) eye to eye with Skeleton shrimp (Caprellidae sp) on sandy sea floor, close-up. Dumaguete, Philippines, Asia.

Ashley Cooper / Snails aestivating on a fence post in the Coto Donana, Andalucia, Spain, June 2011

Robert Thompson / Dog whelk (Nucella lapillus) on rock. Mill Quarter Bay, Killard Point National Nature Reserve, Strangford, County Down, Northern Ireland. February.

Robert Thompson / Dog whelk (Nucella lapillus) and Common barnacle (Semibalanus balanoides) on rock. Mill Quarter Bay, Killard Point National Nature Reserve, Strangford, County Down, Northern Ireland. February.

Robert Thompson / Painted top shell (Calliostoma zizyphinum) and Common barnacle (Semibalanus balanoides) on rock at edge of Strangford Lough. Mill Quarter Bay, Killard Point National Nature Reserve, Strangford, County...

Andy Sands / Two coloured mason bee (Osmia bicolor) collecting leaf mastic to seal nest in old snail shell, Bedfordshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) collecting leaf mastic to seal nest in old snail shell, Bedfordshire, England, UK, June

Sue Daly / Painted top shell (Calliostoma zizyphinum) Trondheimsfjord, Norway, July.

Sue Daly / Egg mass of Necklace shell (Euspira catena) Jersey, British Channel Islands, June 2015

Ingo Arndt / Necklaces made from endemic Polymita land snails for sale to tourists, Cuba

Ingo Arndt / Land snail (Polymita picta roseolimbata) drawn into shell,Cuba. Endemic species.

Ingo Arndt / Land snail (Polymita picta roseolimbata) drawn into shell,Cuba. Endemic species.

Ingo Arndt / Land snail (Polymita picta iolimbata) drawn into shell,Cuba. Endemic species.

Ingo Arndt / Land snail (Polymita muscareum splendita) drawn into shell,Cuba. Endemic species.

Ingo Arndt / Land snail (Cerion torrei moralesi) closed shell on vegetation during dry season to avoid warm temperatures at ground level / Cuba

Ingo Arndt / Land snail (Chondropomedes magnum elizabethae) hanging in cave, with closed shell entrance, from a rope of mucus. A behaviour mostly likely to deter, Cuba

Ingo Arndt / Land snail (Chondropomedes magnum elizabethae) hanging in cave, with closed shell entrance, from a rope of mucus. A behaviour mostly likely to deter, Cuba

Ingo Arndt / Land snail (Emoda sagraiana percrassa) species which deliberately covers its shell in mud, possibly as a form of camouflage, Cuba. Endemic species.

Ingo Arndt / Land snail (Emoda sagraiana percrassa) species which deliberately covers its shell in mud, possibly as a form of camouflage, Cuba. Endemic species.

Steve Downer / Close up of a Common snail (Helix aspersa) emerging from shell. Controlled conditions.

Steve Downer / Common snail (Helix aspersa) emerging from shell. Controlled conditions.

Steve Downer / Centipede (Geophilus sp) emerging from snail shell. UK June.

Steve Downer / Zebra spider (Salticus scenicus) emerging from inside a snail shell, jumps out of shot, controlled conditions.

Nick Upton / Common prawns (Palaemon serratus) scavenging on a damaged Flat top shell (Gibbula umbilicalis) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Cushion star (Asterina gibbosa) moving in a rockpool near a Flat top shell (Gibbula umbilicalis) and a Common prawn (Palaemon serratus), Cornwall, England, UK, September.

Nick Upton / Cushion star (Asterina gibbosa) moving in a rockpool near some Flat top shells (Gibbula umbilicalis), Cornwall, England, UK, September.

Constantinos Petrinos / Marbled cone snail (Conus marmoreus) venomous species, Lembeh Strait, North Sulawesi, Indonesia.

Chris Mattison / Major harp shell (Harpa major) on beach, Borneo.

Chris Mattison / Textile cone shell (Conus textile) on beach, a highly venomous species, Borneo.

Franco Banfi / Blue top snail (Calliostoma ligatum), Alaska, United States, North Pacific Ocean.

Alex Hyde / Terrestrial snail (Hemiplecta sp) Danum Valley, Sabah, Borneo.

Alex Hyde / Giant land snail (Achatinidae) Danum Valley, Sabah, Borneo.

Alex Hyde / Terrestrial snail (Amphidromus sp) Danum Valley, Sabah, Borneo.

Kim Taylor / White-lipped banded snail (Cepaea hortensis) on Wild garlic leaf. Gloucestershire, England, April.

Ingo Arndt / Great Bowerbird (Chlamydera nuchalis) male decorating courting bower with snail shell, Litchfield National Park, Australia.

Ingo Arndt / Jumping spider uses snail shell for shelter, attaches it to grass with web, Germany

Ingo Arndt / Jumping spider uses snail shell for shelter, attaches it to grass with web, Germany

Ingo Arndt / Jumping spider uses snail shell for shelter, attaches it to grass with web, Germany

Ingo Arndt / Jumping spider uses snail shell for shelter, attaches it to grass with web, Germany

Ingo Arndt / Jumping spider uses snail shell for shelter, attaches it to grass with web, Germany

Thomas Marent / Fig (Ficus sp) tree with exposed stilt roots in flooded forest of the Amazon, Amacayacu National Park, Leticia, Colombia

Thomas Marent / Fig (Ficus sp) tree with exposed stilt roots in flooded forest of the Amazon, Amacayacu National Park, Leticia, Colombia

Jen Guyton / Snail-eating snake (Sibon nebulata) extracts a snail from its shell by wedging the shell in the fork of a branch and pulling at the snail's soft body. La Selva Biological Station, Costa Rica.

Andy Sands / Two coloured mason bee (Osmia bicolor) Bee manouvering old snail shell to nest in, Bedfordshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) carrying dead grass to cover nest in old snail shell, Bedfordshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) Bee covering nest in old snail shell with dead grass, Bedfordshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) carrying dead grass to cover nest in old snail shell, Bedfordshire, England, UK, June

Rod Williams / Roman snail (Helix pomatia) Hutchinson's Bank, New Addington, London UK August

Kim Taylor / RF- White-lipped banded snail (Cepaea hortensis) on Wild garlic leaf. Gloucestershire, England, April.

Ingo Arndt / Necklaces made from endemic Polymita land snails for sale to tourists. Cuba.

Franco Banfi / Textile cone shell (Conus textile) Walindi, West New Britain, Papua New Guinea, Pacific Ocean

Franco Banfi / Geographic cone (Conus geographus) Walindi island, West New Britain, Papua New Guinea, Pacific Ocean

Franco Banfi / Marble cone shell (Conus marmoreus) Walindi, West New Britain, Papua New Guinea, Pacific Ocean

Andy Sands / Two coloured mason bee (Osmia bicolor) bee that nests in old snail shells and then carries bits of twig or vegetation to cover the shell, Buckinghamshire, England, UK, June

Andy Sands / Two coloured mason bee (Osmia bicolor) bee that nests in old snail shells and then carries bits of twig or vegetation to cover the shell, Buckinghamshire, England, UK, June

Jan Hamrsky / River snail (Viviparus contectus) closing shell opening with operculum, Europe, July. Controlled conditions.

Georgette Douwma / Helmet shell (Cassis cornuta) on seabed Lembeh Strait, Sulawesi, Indonesia.

Solvin Zankl / Copse snail (Arianta arbustorum) on oak tree branch in rain, Nationalpark Hohe Tauern / High Tauern National Park, Austria. May.

MYN / Dimitris Poursanidis / Sea snail shell (Pollia scacchiana) Greece. meetyourneighbours.net project

James Christensen / Land Snail (Aperostoma quitensis) withdrawn inside its shell, Septimo Paraiso Cloud Forest Reserve, Mindo, Ecuador

Chien Lee / Clustertree (Ficus racemosa) figs, Malaysia

Thomas Marent / Fig (Ficus sp) tree, Manas National Park, Assam, India

Thomas Marent / Fig (Ficus sp) tree, Manas National Park, Assam, India

Thomas Marent / Fig (Ficus sp) tree with extensive aerial roots, Arusha National Park, Tanzania

Jan Hamrsky / Great ramshorn snail (Planorbarius corneus) Europe, June, controlled conditions.

Jan Hamrsky / Freshwater snail (Planorbidae) on stem, Europe, June, controlled conditions.

Jan Hamrsky / Nautilus ramshorn snail (Gyraulus crista) on stem, Europe, June, controlled conditions.

Kim Taylor / Brown-lipped banded snail (Cepaea nemoralis) in apple tree. Surrey, England, April.

Kim Taylor / Brown-lipped banded snail (Cepaea nemoralis) in apple tree. Surrey, England, April.

Alex Hyde / Detail of Purple Topshell (Gibbula umbilicus) found washed up on a beach. Claigan, Isle of Skye, Inner Hebrides, Scotland, UK. April.

Chris Mattison / Textile cone shell (Conus textile) shell, highly venomous species.

Olga Kamenskaya / Snails (Baicalia turriformis, Acroloxidae sp and Choanomphalus sp) Lake Baikal, Russia, May.