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

Ingo Arndt / Land snail / Brown-lipped snail (Cepaea nemoralis) crawling over a razor blade. The constantly produced mucus is a protection shield between the sole of the snail and the razor blade whilst the snail...

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

Alex Mustard / Nudibranchs (Doto greenamyeri) newly described species on feather hydroids. Seraya Bay, north coast of Bali, Indonesia. Java Sea.

Alex Mustard / Portrait of a Nudibranch (Flabellina pellucida) on a kelp frond with star trails. Gulen, Norway. North East Atlantic Ocean.

Ammonite / Close-up of a Yellow slug (Limax flavus) moving towards the camera leaving a slime trail and extending and retracting its eyestalk, footage taken using an endoscopic camera, Bristol, England, UK, Marc...

Ammonite / Close-up of a Yellow slug (Limax flavus) leaving a slime trail as it moves, footage taken using an endoscopic camera, Bristol, England, UK, March.

Alex Mustard,Alex Mustard / A nudibranch (Dendronotus frondosus) photographed in the field aquarium, Gulen, Norway. North East Atlantic.

Alex Mustard,Alex Mustard / A portrait of a nudibranch ( Limacia clavigera) searching for food on algae. Gulen, Norway. North East Atlantic Ocean.

Alex Mustard / Flamingo tongue (Cyphoma gibbosum) feeding on a seafan (Gorgonia ventalina) Cyphomas feed on corals and concentrate the toxic chemicals into their mantle, which they then wrap around the outside of it...

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

Nick Upton / 2020VISION / Common snail (Helix aspersa) crawling in lawn grass in front of the Royal Crescent, Bath, England, UK, April