John Waters / Timelapse of flies and a slug on a Common stinkhorn fungus (Phallus impudicus), Mendips, Somerset, UK, July.

Steve Downer / Slug (Species unknown) descending on slime rope from leaf. UK. June.

Ron Bielefeld / Snail Kite (Rostrhamus sociabilis) male flying with snail prey, Florida

Ron Bielefeld / Snail Kite (Rostrhamus sociabilis) male flying with snail prey, Florida

Ron Bielefeld / Snail Kite (Rostrhamus sociabilis) male flying with snail prey, Florida

Ron Bielefeld / Snail Kite (Rostrhamus sociabilis) female flying with snail prey, Florida

James Christensen / Andean Snail-eater (Dipsas andiana) female and Land Snail (Drymaeus sp) prey near city, Mindo, Ecuador

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.

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.

Alex Mustard / 2020VISION / Nudibranch eggs (Tritonia hombergi) Loch Carron, Ross and Cromarty, Scotland, UK, April

Hiroya Minakuchi / Kunie's Chromodorid Nudibranch (Chromodoris kuniei), Borneo, Malaysia

Hiroya Minakuchi / Nudibranch (Hypselodoris bullockii) pair mating, Borneo, Malaysia

Juergen Freund / Chromodoris nudibranch (Cadlinella sp.) Lembeh Strait, North Sulawesi, Indonesia.

Stephen Dalton / Great grey / Leopard slug (Limax maximus) on toadstool, UK, controlled conditions

Wild Wonders of Europe / Wothe / Male Carpathian blue slug (Bielzia coerulans) Morske Oko Reserve, Slovakia, June 2008

Wild Wonders of Europe / D'Amicis / Carpathian blue slug (Bielzia coerulans) on leaf, endemic to the Carpathian mountains, Western Tatras, Carpathian Mountains, Slovakia, June 2009

Piotr Naskrecki / Beetle predating on snail who responds with defensive bubbles, Atewa Range, Ghana

Piotr Naskrecki / Two slugs exchanging fluids, Atewa Range, Ghana

Birgitte Wilms / Nudibranch laying eggs, Indonesia

Martin Dohrn / Red forms of Black slug {Arion ater} mating, Northern Italy, Europe

Konrad Wothe / Edible Snail (Helix pomatia) in motion, Germany

Konrad Wothe / Edible Snail (Helix pomatia) crossing moss on floor of deciduous forest, Germany

Norbert Wu / Nudibranch (Chromodoris sp) breathes through gills on back, Borneo

Norbert Wu / Flamingo Tongue Snail (Cyphoma gibbosum) feeding on Common Sea Fan (Gorgonia ventalina) showing deep purple tone where the Sea Fan has released protective compounds, Saba, Caribbean

Fred Bavendam / Cowry living on Sea Fan (Solenocaulon sp), Bali, Indonesia

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

Fred Bavendam / Giant Nudibranch (Dendronotus iris) attacking a Tube-dwelling Anemone (Pachycerianthus fimbriatus), Vancouver Island, British Columbia, Canada. Sequence 4 of 5

Flip Nicklin / Naked Sea Butterfly (Clione limacina) underwater portrait, Arctic

Jason Smalley / Close-up of Slug {Arion ater rufus} feeding on leaf, UK

David Welling / Banana Slug on leaf, California, USA

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

Gary Bell/ Oceanwide / Nudibranch (Ceratosoma sp) with commensal Emperor Shrimp (Periclimenes imperator), Philippines

Gary Bell/ Oceanwide / Nudibranch (Ceratosoma sp) with commensal Emperor Shrimp (Periclimenes imperator), Philippines

Gary Bell/ Oceanwide / Dorid Nudibranch (Phyllidia varicosa), Anilao, Philippines

Gary Bell/ Oceanwide / Nudibranch (Phyllodesmium serratum), Port Phillip Bay, Mornington Peninsula, Victoria, Australia

Gary Bell/ Oceanwide / Tyron's Risbecia (Risbecia tryoni) with commensal Emperor Shrimp (Periclimenes imperator), Milne Bay, Papua New Guinea

Gary Bell/ Oceanwide / Tyron's Risbecia (Risbecia tryoni) with commensal Emperor Shrimp (Periclimenes imperator), Milne Bay, Papua New Guinea

Gary Bell/ Oceanwide / Nudibranch (Goniobranchus kuniei), Anilao, Philippines

Gary Bell/ Oceanwide / Nudibranch (Phyllodesmium longicirrum), Philippines

Gary Bell/ Oceanwide / Nudibranch (Chromodoris bullocki), Bali, Indonesia

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

Philippe Clement / Greville's bolete / larch bolete fungus (Suillus grevillei), showing underside partially eaten by slugs in autumn forest, Belgium, October

Chris Mattison / Violet ground beetle (Carabus violaceus) a predatory carabid beetle that eats slugs. Monmouthshire, June.

Paul Bertner / Snail climbing up spider thread, Bukit Barisan Selatan National Park, Indonesia

Paul Bertner / Snail female laying eggs, Bukit Barisan Selatan National Park, Indonesia

Paul Bertner / Snail, Mindo Cloud Forest, Ecuador

Paul Bertner / Slug, Montagne D'Ambre National Park, Madagascar

Robert Thompson / Dog vomit slime mold (Fuligo septica) and slug on moss. Annagarriff Wood National Nature Reserve, Peatlands Park, County Armagh, Northern Ireland. August.

Paul Bertner / Snail with red eye stalks, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Snail with red eye stalks, Gunung Leuser National Park, Sumatra, Indonesia

Paul Bertner / Firefly (Lampyridae) larva feeding on snail, Yasuni National Park, Ecuador

Paul Bertner / Land Snail (Edentulina sp) with snail prey, Amani Nature Reserve, Tanzania

Paul Bertner / Leatherleaf Slug (Veronicellidae), new species, Ranomafana National Park, Madagascar

Paul Bertner / Leatherleaf Slug (Veronicellidae), new species, Ranomafana National Park, Madagascar

Paul Bertner / Army Ant (Leptogenys sp) group attacking snail, Angkor Wat, Cambodia

Ingo Arndt / Leopard slug (Limax maximus) mating pair following each other shortly before mating. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs, Sw...

Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs, Switzerland

Ingo Arndt / Leopard slug (Limax maximus) climbing and eating at the same time a rope of mucus after mating. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male...

Ingo Arndt / Leopard slug (Limax maximus) climbing and eating at the same time a rope of mucus after mating. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male...

Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs.Switzerland. Sequence...

Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs.Switzerland. Sequence...

Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs.Switzerland. Sequence...

Steve Downer / Baby slug, species uncertain, on underside of backlit leaf. Controlled conditions.

Steve Downer / Baby slug, species uncertain, on underside of backlit leaf. Controlled conditions.

Steve Downer / Pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.

Steve Downer / Close up of a pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.

Steve Downer / Close up of a pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.

Steve Downer / Pair of Black slugs (Arion ater agg.) mating, showing external sperm transfer, Birmingham, England, UK, October.

Steve Downer / Two Black slugs (Arion ater agg.), showing black and red colour variations, Birmingham, England, UK, August.

Steve Downer / Slug (Species unknown) descending on slime rope from leaf. UK. June.

Steve Downer / Slug (Species unknown) descending on slime rope from leaf. UK. June.

Steve Downer / Close shot of newly hatched slug (unknown species) moving over developing eggs. UK.

Steve Downer / Slug embryos, species unknown, moving in egg cases. UK

Steve Downer / Slug embryo, species uncertain, moving in egg case. UK.

Steve Downer / Newly hatched slug, species unknown, moving over developing eggs. UK.

Steve Downer / Newly hatched slug, species unknown, moving over developing eggs. UK.

Steve Downer / Close-up slug embryo, species unknown, moving in egg case. UK.

Steve Downer / Group of slug embryos, species unknown, moving in egg cases. UK.

Steve Downer / Group of slug embryos, species unknown, moving in egg cases. UK.

Steve Downer / Close-up slug embryo, species unknown, moving in egg case. Birmingham UK

Steve Downer / Slug embryo, species unknown, moving in egg case. UK.

John Cancalosi / Pair of Great grey slugs (Limax maximus) mating, hermaphroditic species, New York, USA, August.

John Cancalosi / Pair of Great grey slugs (Limax maximus) mating, hermaphroditic species, New York, USA, August.

Nick Upton / Young boy and mother holding Leopard / Great grey slugs (Limax maximus) found in garden, Bristol, UK, October 2014. Model released.

Nick Upton / Mother and young boy holding garden snails (Helix aspersa) and Leopard /Great grey slugs (Limax maximus) in their hands, Bristol, garden UK, October 2014. Model released.

Alex Hyde / Red slugs (Arion rufus) mating. Derbyshire, UK, September.

Ingo Arndt / Netted slug (Deroceras reticulatum) hatching from egg pouch, Germany

Ingo Arndt / Dusky slug {Rufus subfuscus} 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

Steve Gettle / Land Snail (Caracolus sp), Tandayapa Valley, Ecuador

Ingo Arndt / Carpathian blue slug (Bielzia coerulans) detail of eye on antenna / Slovakia

Ingo Arndt / Leopard slug (Limax maximus) mating, hanging from a rope of mucus. These slugs are hermaphrodites and can be seen here transferring sperm to one another through their male organs.Switzerland. Sequence...