Brian Bevan / Two Giant african snails (Achatina fulica) emerging from their shells and looking around, UK. Captive.

Konrad Wothe / Giant snail (Megalobulimus) in a lowland rainforest, Panguana Reserve, Huanuco Region, Peru.

Konrad Wothe / Giant land snail (Megalobulimus sp), Panguana Reserve, Huanuco province, Amazon basin, Peru.

Mark Bowler / Giant african landsnail (Achatina maculata)

Martin Gabriel / Two Giant African snail {Achatina fulica} shells in sand.

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

Duncan Murrell / Giant land snails (Bertia brookei), Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, Malaysian Borneo.

David Perpinan / Use of a doppler probe to detect heart rate in a captive African giant snail (Achatina fulica), Small repro only.

Richard Herrmann / Bat Star (Asterina miniata) group and sea snails feeding on Ocean Sunfish (Mola mola) that was killed by California Sea Lion (Zalophus californianus), Monterey Bay, California

Konrad Wothe / Giant snail (Megalobulimus) in a lowland rainforest, Panguana Reserve, Huanuco Region, Peru.

Alex Hyde / Giant land snail (Achatinidae) Danum Valley, Sabah, Borneo.

Jiri Lochman / Giant Australian Land Snail (Heydleyella falconeri), Border Range National Park, Gondwana Rainforest UNESCO Natural World Heritage Site, New South Wales, Australia.