Duncan Usher / Turbinate Monodont (Monodonta turbinata) shells collected from North Sea seen in ultraviolet light, Spain. Sequence 2 of 2

Duncan Usher / Turbinate Monodont (Monodonta turbinata) shells collected from North Sea, Spain. Sequence 1 of 2

Juergen Freund / Land snail on a leaf in the forest, Bako National Park, Sarawak, Borneo

Juergen Freund / Land snail on a decaying leaf in the forest, Bako National Park, Sarawak, Australia

Juergen Freund / Seaslugs (Plakobranchus ocellatus) Raja Ampat, West Papua, Indonesia

Norbert Wu / Nudibranch (Dorididae), Ambon, Indonesia

D. Parer & E. Parer-Cook / Gastropod tracks on beach sand, Torres Strait, Australia

D. Parer & E. Parer-Cook / Atlantic Trumpet Triton (Charonia tritonis) feeding on Crown-of-thorns Starfish (Acanthaster planci), Great Barrier Reef, Queensland, Australia

Sue Daly / Group of nudibranchs (Tambja verconis) Poor Knights Islands, New Zealand, January

Sue Daly / Nudibranchs (Tambja verconis) Poor Knights Islands, New Zealand, January

Franco Banfi / Nudibranch, (Flabellina sp.) Arctic circle Dive Center, White Sea, Karelia, northern Russia

Franco Banfi / Nudibranch (Phyllidiella rosans) Maldives, Indian Ocean

Franco Banfi / Nudibranches (Phyllidiella rudmani) Maldives, Indian Ocean

Michele Westmorland / Nudibranch (Aegires serenae), Palau, Micronesia.

Michele Westmorland / Sea slug (Chelidonura amoena) pair mating, Palau, Micronesia

Piotr Naskrecki / Fig (Ficus sp) tree strangling host tree, Suriname

Nick Upton / Violet ground beetle (Carabus violaceus) attacking a small Grey field slug / Netted slug (Deroceras reticulatum), Hertfordshire garden, UK, August.

Chris Mattison / Green tree snail (Papustyla sp.), Mulu, Sarawak, Borneo.

Chris Mattison / Black Slug (Arion ater) grey form. Yorkshire, UK, September.

Loic Poidevin / Red slugs (Arion rufus) mating, West France

David Woodfall / Black slug feeding on grasses in early morning dew, Gilfach Nature Reserve, Radnorshire Wildlife Trust, Powys, Wales, UK

Alex Hyde / Great Grey / Leopard Slug {Limax maximus} photographed on a white background. Derbyshire, UK. July

Alex Hyde / Great Grey / Leopard Slug (Limax maximus) photographed on a white background. Derbyshire, UK. July

Georgette Douwma / Edible sea cucumber (Holothuria edulis) one of the edible species of sea cucumbers served as 'sea slugs', 'trepang' or 'Beche de mer'. Maldives, Indian Ocean

Pete Oxford / Land Snail (Caracolus sp) in rainforest, Yasuni National Park, Amazon Rainforest, Ecuador

Hiroya Minakuchi / Fig (Ficus sp) fruit, Malaysia

David Shale / Gastropod shell. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Gastropod sea snail showing opening operculum ('lid'). Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Gastropod shell. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Gastropod (Fusitriton) head detail. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Gastropod (Fusitriton) sea snail with epiphytes. Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Trochid gastropod - Otukaia (Calliostomatidae). Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

David Shale / Trochid gastropod - Otukaia (Calliostomatidae). Collected from coral sea mount near Dragon vent field on SW Indian Ridge, Indian Ocean.

Solvin Zankl / Veliger snail larvae, Trondheimsfjord, North Atlantic Ocean.

Chris Newbert / Nudibranch (Halgerda malesso) skin, Indonesia

Chris Newbert / True Conch (Strombus aurisdianae) eyes, Indonesia

Chris Newbert / Nudibranch (Glossodoris cincta), Indonesia

Alex Mustard / 2020VISION / Nudibranch (Facelina auriculata) searching for its food of small hydroids by climbing on a blade of Seagrass / Eelgrass (Zostera marina) in seagrass meadow. Helford Estuary, Cornwall, UK, July

Rolf Nussbaumer / Banded scrubsnail (Praticolella berlandieriana) adult crawling on branch with reflection in water, Dinero, Lake Corpus Christi, South Texas, USA.

MYN / Niall Benvie / Composite of animals and plants found in gardens, fields and hedgerows around Preproche, Burgundy, France, Summer 2011 meetyourneighbours.net project

Martin Willis / Double-eyed Fig-Parrot (Cyclopsitta diophthalma) male eating fruit from Fig (Ficus sp), Atherton Tableland, Queensland, Australia

Norbert Wu / Sea Snail (Nacella concinna) on Brown Algae (Cystosphaera jacquinotii) blade, Palmer Station, Antarctic Peninsula, Antarctica

Konrad Wothe / Snail (Zonitidae) on dew covered grass, Bavaria, Germany

MYN / Niall Benvie / Great grey slug or Tiger slug (Limax maximus), Scotland, UK, August meetyourneighbours.net project

Rod Williams / Black slug (Arion ater) orange form on leaf, South London, UK, September

Rod Williams / Black slug (Arion ater) orange form on leaf, South London, UK, September

Robin Chittenden / Leopard / Great grey slug (Limax maximus) Norwich, UK, July

Robin Chittenden / Leopard / Great grey slug (Limax maximus) Norwich, UK, July

Nick Upton / 2020VISION / Black slug (Arion ater), brown form, crawling over patio after rain, with house and garden bench in the background, Wiltshire, UK, July . Property released.

Steve Gettle / Land Snail (Drymaeus sp), Ecuador

Alex Hyde / European black slugs (Arion ater) brown variety, mating on leaf litter, Midi-Pyrenees, France. August.

Linda Pitkin / 2020VISION / Nudibranch (Tritonia hombergi), St Abbs (St Abbs and Eyemouth Voluntary Marine Reserve), Berwickshire, Scotland, UK, October 2011

Simon Colmer / Snail and slug trap amongst lettuces, UK

Simon Colmer / Slug and snail damage on courgette leaves, UK

Simon Colmer / Radish (Raphanus genus) eaten by slugs and snails, UK

Simon Colmer / Garden pansy (Viola sp) eaten by slugs and snails, UK

MYN / Jerry Monkman / Red-gilled nudibranch (Flabellina verrucosa) Rye, New Hampshire, USA, January. meetyourneighbours.net project

MYN / Jerry Monkman / Great gray slug (Limax maximus) Rye, New Hampshire, USA, September meetyourneighbours.net project

Willem Kolvoort / Endemic freshwater snail on rock with antennae extended, Albania, Eastern Europe, May

Willem Kolvoort / Endemic freshwater snail on rock with antennae extended, Albania, Eastern Europe, May

Kevin Schafer / Fig (Ficus sp) parasitizing host tree, Tompotike Peninsula, central Sulawesi, Indonesia

Norbert Wu / Lion Nudibranch (Melibe leonina) group on kelp blade with hoods extended as they feed in the ocean current, Vancouver Island, British Columbia, Canada

Norbert Wu / Lion Nudibranch (Melibe leonina) group on kelp blade with hoods extended as they feed in the ocean current, Vancouver Island, British Columbia, Canada

Norbert Wu / Lion Nudibranch (Melibe leonina) with hood extended as it feeds in the ocean current, Vancouver Island, British Columbia, Canada

Norbert Wu / Cockscomb Nudibranch (Janolus barbarensis), Vancouver Island, British Columbia, Canada

David Shale / Deepsea gastropod (Gastropoda) from Dragon Vent field, Indian Ocean, November 2011

David Shale / Deepsea gastropod (Gastropoda) from Dragon Vent field, Indian Ocean, November 2011

David Shale / Deepsea Gastropod mollusc from a coral seamount in the Indian Ocean, November 2011

Alex Mustard / 2020VISION / Large nudibranch (Tritonia hombergi) with eggs. The eggs are from this species of nudibranch and the adult seems to be feeding on them, which is unusual. The adult may have just laid the eggs and may...

Alex Mustard / 2020VISION / Nudibranch (Tritonia hombergi) feeding on soft coral Dead man's fingers (Alcyonium digitatum) Loch Carron, Scotland, UK, April

Alex Mustard / 2020VISION / Nudibranch (Facelina auriculata) feeding on small hydroids growing on top of a rock, Selsey, West Sussex, UK, May

Alex Mustard / 2020VISION / Nudibranch (Facelina auriculata) searching for small hydroids on top of a boulder, Selsey, West Sussex, UK, May

Alex Mustard / 2020VISION / Nudibranch (Flabellina pedata) gliding over a red sponge, Selsey, West Sussex, UK, May

Stephen Dalton / Slug (Gastropoda) and slime trail over moss. Umbria, Italy, April.

Hiroya Minakuchi / Lion Nudibranch (Melibe leonina) feeding, California

Konrad Wothe / White-lipped Grove Snail (Cepaea hortensis) hortensis) on Knapweed (Centaurea sp) flower, Bavaria, Germany

Christian Ziegler / Land Snail (Camaenidae) at night, Lambir Hills National Park, Sarawak, Malaysia

Christian Ziegler / Lettuce Sea Slug (Elysia crispata), Bastimentos Marine National Park, Bocas del Toro, Panama

Pete Oxford / Lettuce Sea Slug (Elysia crispata), Bonaire, Netherlands Antilles, Caribbean

Kevin Schafer / Banana Slug (Ariolimax columbianus) on trunk of Island Oak (Quercus tomentella), Channel Islands National Park, California

Georgette Douwma / Nudibranch (Glossodoris atromarginata). Superfamily Cryptobranchia, Family Chromodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / 'Sea Bunny' Nudibranch (Jorunna parva). Superfamily Cryptobranchia, family Discodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Phyllodesmium crypticum). Suborder Aeolidina, family Facelinidae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Trinchesia yamasui). Suborder Aeolidina, Family Tergipedidae, Genus Trinchesia. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Phyllodesmium crypticum). Suborder Aeolidina, family Facelinida. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Phyllodesmium crypticum). Suborder Aeolidina, family Facelinidae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Trinchesia sibogae) with nudibranch eggs behind. Suborder Aeolidina, Family Tergipedidae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Glossodoris atromarginata). Superfamily Cryptobranchia, Family Chromodorididae. Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Trinchesia yamasui). Rinca, Komodo National Park, Indonesia.

Georgette Douwma / Nudibranch (Trinchesia sibogae). Suborder Aeolidina, Family Tergipedidae. Rinca, Komodo National Park, Indonesia.

Juergen Freund / Nudibranch (Armina sp) on white background, Batangas, Philippines.

Juergen Freund / Mass of spawn of an infaunal head-shield slug (Philine sp) Batangas, Philippines. Philinids live in clean sand where they ingest bivalves with their radula and crush them with their massive gizzard p...

Juergen Freund / Nudibranch (Thecacera sp) on reef, West Papua, Indonesia.

Birgitte Wilms / Cowry (Aclyvolva sp) camouflaged on Soft Coral (Ctenocella sp), Papua New Guinea

Birgitte Wilms / Nudibranch (Nembrotha sp) pair mating, Papua New Guinea

Birgitte Wilms / Nudibranch on coral, Solomon Islands