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