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