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

Mark Bowler / Giant african landsnail (Achatina maculata)

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

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

Jen Guyton / Giant ground snail (Achatina sp.) at dusk in Gorongosa National Park, Mozambique.

Jen Guyton / Giant ground snail (Achatina sp.) at dusk in Gorongosa National Park, Mozambique.

Jen Guyton / Giant ground snail (Achatina sp.) at dusk in Gorongosa National Park, Mozambique.

Tony Heald / Giant snail (Achatina fulica) drinking on a wet road, Kruger National Park, South Africa.

Cyril Ruoso / Giant African land snail (Achatina sp) on twig, South East Cameroon, July 2008.

Cyril Ruoso / Baka child holding a Giant African land snail (Achatina sp) South East Cameroon, July 2008.

Adrian Davies / Giant African land snail (Achatina fulica) Barbados. Invasive pest species.

Adrian Davies / Giant African land snail (Achatina fulica) Barbados. Invasive pest species.

Enrique Lopez-Tapia / Giant African land snail (Achatina fulica) Royal Bardia National Park, Nepal, October 2011.

Kristel Richard / Three Giant African Land Snails (Achatina fulica) on wooden boards in the rain, Mahe, Seychelles, May

MYN / Joris van Alphen / Giant African land snail (Lissachatina fulica) native to East Africa, pantropically invasive, photographed in Sabah, Borneo, Malaysia. Meetyourneighbours.net project

Cyril Ruoso / Giant African Land Snail (Achatina fulica), southern Madagascar

Mark Carwardine / Giant African land snail (Achatina sp) close up of eye stalks, captive, from tropical forests East africa

Nick Upton / Giant African Land Snail (Achatina fulica) on a branch. Guandu, Taiwan, September.

Edwin Giesbers / Giant African land snail (Achatina fulica) camouflaged on palm frond, Sarawak, Borneo, Malaysia

Tony Phelps / Giant snail (Achatina fulica) de Hoop Nature reserve, Western Cape, South Africa

Mark Bowler / Giant african landsnail (Achatina maculata)

Mark Bowler / Giant african landsnail (Achatina maculata)

Mark Bowler / Giant african landsnail (Achatina maculata)

Vincent Grafhorst / Giant African Land Snail (Achatina fulica), Kirindy Forest, Madagascar

Vincent Grafhorst / Giant African Land Snail (Achatina fulica), Kirindy Forest, Madagascar

Piotr Naskrecki / Giant African Land Snail (Achatina sp) group on platter, Atewa Range, Ghana

Barry Bland / Giant African Snail {Achatina marginata}

Barry Bland / Close up of head and antennae of Giant African Snail {Achatina marginata}

Barry Bland / Close up of antennae of Giant African Snail {Achatina marginata}

Barry Bland / Giant African Snail {Achatina marginata}

John Cancalosi / Boy observing Giant african land snail {Achatina marginata} captive, England

Ashok Jain / African snail (Achatina sp.) laying eggs. North Delhi ridge, India

Dan Burton / Giant african snail {Achatina marginata}

Ashok Jain / African snail. India (Achatina sp) From a snail garden discovered on the New Delhi Ridge

Piotr Naskrecki / Giant African Land Snail (Achatina sp) pair mating, Gorongosa National Park, Mozambique

Dan Burton / Giant african snail {Achatina marginata} captive

John Cancalosi / Boy observing Giant African land snail (Achatina fulica), England, UK. Captive. Model released

Nick Hawkins / An invasive giant African land snail (Achatina fulica) in cloud forest, Choco region, Northwestern Ecuador.