Franco Banfi / Headshield slugs (Micromelo undatus) Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean

Tony Wu / Rose petal bubble shell (Hydatina physis) is gathering and arranging freshly secreted eggs on its mantle, prior to attaching the completed egg mass to the sand with a mucous thread, Kanagawa, Japan.

Tony Wu / Rose petal bubble shell (Hydatina physis) gathering and arranging freshly secreted eggs on its mantle, prior to attaching the completed egg mass to the sand with a mucous thread, Kanagawa, Japan.

Magnus Lundgren / Wild Wonders of China / Royal paper bubble (Aplustrum amplustre) with eggmass in the side, Green Island, Taiwan.