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

Robin Chittenden / Boy observing Black slug (Arion ater), brown form. Norfolk, UK. September 2017.

Michael Hutchinson / Red slug (Arion rufus), Bristol, England, UK, September.

Ingo Arndt / Dusky slug (Arion rufus) with body extended, Germany, May.

Ingo Arndt / Dusky slug (Arion rufus) retracted for protection, Germany, May.

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

Ingo Arndt / Dusky slug {Rufus subfuscus} Germany

Fabrice Cahez / Red slug (Arion rufus) Vosges, France, September.

Laurent Geslin / Red slug (Arion rufus) in urban environment, Grenoble, France, September.

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

Konrad Wothe / Chocolate Arion (Arion rufus) eggs in the ground, Bavaria, Germany

Rod Williams / European Red slug (Arion rufus) London, UK September

Konrad Wothe / Chocolate Arion (Arion rufus) eating leaf, Bavaria, Germany

Konrad Wothe / Chocolate Arion (Arion rufus) eating leaf, Bavaria, Germany

Philippe Clement / Red slug {Arion rufus} feeding on Stinkhorn fungus {Phallus impudicus} Belgium

Dietmar Nill / Red slug on garden path {Arion rufus} Germany

Heidi & Hans-Juergen Koch / Chocolate Arion (Arion rufus) group collected by Sabine Mlynek, who uses them in traditional bronchitis medicine for Domestic Horses (Equus caballus), Germany

Dietmar Nill / Red slug feeding on flower {Arion rufus} Germany

Natalie Clements / Large Red Slug (Arion rufus) crawling across garden path, Cardiff, Wales, UK, August.

Natalie Clements / Tracking shot of Large Red Slug (Arion rufus) feeding on leaf, Cardiff, Wales, UK, August.

Konrad Wothe / Red slug (Arion rufus) resting, portrait, France. August.

Konrad Wothe / Red slug (Arion rufus) moving over moss, France. August.

Nick Upton / Large Red slug (Arion rufus) crawling over soil in a flowerpot at night, Wiltshire, UK, October.

Nick Upton / Millipede (Leptoiulus sp.) feeding on the mucus of a Garden snail (Cornu aspersum) in a flowerpot at night, Wiltshire, UK, October.

Nick Upton / Large Red slug (Arion rufus), orange form, fully retracted against a white background, Wiltshire, UK, October.

Nick Upton / Large Red slug (Arion rufus), orange form fully retracted on a log in a garden at night, Wiltshire, UK, October.

Nick Upton / Large Red slug (Arion rufus) crawling over a garden patio at night, Wiltshire, UK, October.

Nick Upton / Large Red slug (Arion rufus) crawling over a garden patio at night, Wiltshire, UK, October.

Andy Sands / Red slug (Arion rufus) pair mating amongst leaf litter. Buckinghamshire, England, UK. October. Focus stacked image.