Philippe Clement / Two White piddock (Barnea candida) shells on beach, Belgium

Philippe Clement / Surf clam (Spisula solida) shell, Belgium

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) shells, Normandy, France

Philippe Clement / Rayed trough shells (Mactra stultorum cinerea / Mactra corallina cinerea) on beach, Belgium

Philippe Clement / Warty venus (Venus verrucosa) shell on beach, Mediterranean, France

Philippe Clement / Surf clam (Spisula solida) shell on beach, Belgium

Philippe Clement / Common otter shell (Lutraria lutraria) shell, Mediterranean, France

Philippe Clement / Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea) on beach, Belgium

Philippe Clement / Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea) on beach, Belgium

Philippe Clement / Five Pholadidae, Common piddock (Pholas dactylus), American piddock (Petricola pholadiformis) and White piddock (Barnea candida) shells, Normandy, France

Philippe Clement / Smooth / Norway cockle (Laevicardium crassum) shell showing inside, Normandy, France

Philippe Clement / Rayed artemis (Dosinia exoleta) shell, Normandy, France

Philippe Clement / Detail of American jackknife / Razor clam (Ensis directus / americanus) shell, Normandy, France

Philippe Clement / Cut trough shell (Spisula subtruncata) shells, Belgium

Philippe Clement / Common piddock (Pholas dactylus) shell, Normandy, France

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) on beach, Normandy, France

Philippe Clement / Rayed artemis (Dosinia exoleta) shell on beach, Normandy, France

Philippe Clement / Collection of shells: Common Mussel (Mytilus edulis), Baltic tellin shell (Macoma balthica), Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea), Netted dog whelk (Nassarius retic...

Philippe Clement / Pullet carpet shell (Venerupis senegalensis), Normandy, France

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) shells, one with inside showing, the other the outside, Normandy, France

Philippe Clement / Rayed trough shells (Mactra stultorum cinerea / Mactra corallina cinerea), Belgium

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) one half showing inside, the other the outside, Belgium

Philippe Clement / Warty venus (Venus verrucosa) shells showing inside and outside, Mediterranean, France

Philippe Clement / Seven Mactridae shells, Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea), Surf clam (Spisula solida) and Cut trough shells (Spisula subtruncata), Belgium

Philippe Clement / Warty venus (Venus verrucosa) shell on beach, Mediterranean, France

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) shell inside, Belgium

Philippe Clement / Rayed trough shells (Mactra stultorum cinerea / Mactra corallina cinerea), Belgium

Philippe Clement / Common otter shell (Lutraria lutraria) shell on beach, Normandy, France

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) shells, Normandy, France

Philippe Clement / Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea) on beach, Belgium

Philippe Clement / Surf clam (Spisula solida) shell, inside, Belgium

Philippe Clement / Smooth / Norway cockle (Laevicardium crassum) shell, Normandy, France

Philippe Clement / Rayed trough shells (Mactra stultorum cinerea / Mactra corallina cinerea), Belgium

Philippe Clement / Five Pholadidae, Common piddock (Pholas dactylus), American piddock (Petricola pholadiformis) and White piddock (Barnea candida) shells, Normandy, France

Philippe Clement / Smooth / Norway cockle (Laevicardium crassum) shell on beach, Normandy, France

Philippe Clement / Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea), Belgium

Philippe Clement / Cut trough shell (Spisula subtruncata) three shells on beach, Belgium

Philippe Clement / Common piddock (Pholas dactylus) shell, Normandy, France

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) on beach, Normandy, France

Philippe Clement / Rayed artemis (Dosinia exoleta) inside of shell, Normandy, France

Philippe Clement / Collection of shells: Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea), Common oyster (Ostrea edulis), Scallop shell (Pecten jacobeus), Smooth cockle / Norway cockle (Laevicard...

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) on beach, a small and a large one, Normandy, France

Philippe Clement / Pullet carpet shell (Venerupis senegalensis) showing inside, Normandy, France

Philippe Clement / Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea), Belgium

Philippe Clement / Pullet carpet shell (Venerupis senegalensis), Belgium

Philippe Clement / Pullet carpet shell (Venerupis senegalensis), Belgium

Philippe Clement / Warty venus (Venus verrucosa) shell, Mediterranean, France

Philippe Clement / Rayed trough shell (Mactra stultorum cinerea / Mactra corallina cinerea) showing inside, Belgium

Philippe Clement / American jackknife / razor clam (Ensis directus / americanus) shells on beach, Belgium

Philippe Clement / American piddock (Petricola pholadiformis) shells on beach, Belgium

Philippe Clement / Cut trough (Spisula subtruncata) shell, showing the inside, Belgium

Philippe Clement / Banded wedge (Donax vittatus) shell on beach, Belgium

Philippe Clement / Banded wedge shell (Donax vittatus) shell, Belgium

Philippe Clement / American jackknife / razor clam (Ensis directus / americanus) shells, Belgium

Philippe Clement / Three Cut trough shell (Spisula subtruncata) shells, one showing the inside, Belgium

Philippe Clement / American piddock (Petricola pholadiformis) shell, Belgium

Philippe Clement / Cut trough (Spisula subtruncata) shell, Belgium

Philippe Clement / Banded wedge (Donax vittatus) shells, Belgium

Philippe Clement / Banded wedge shell (Donax vittatus) on beach, Belgium

Juergen Freund / Mantle of Giant clam {Tridacna gigas} on seabed, Indo-pacific

Juergen Freund / Syphon of Giant clam {Tridacna gigas} on seabed, Indo-pacific

Juergen Freund / Syphon of Giant clam {Tridacna gigas} on seabed, Indo-pacific

Juergen Freund / Giant clam {Tridacna gigas} on seabed, Indo-pacific

Juergen Freund / Giant clam {Tridacna gigas} on seabed, Indo-pacific

Juergen Freund / Clam {Tridacna sp} encrusted with corals, Indo-pacific

Juergen Freund / Detail of syphon of Giant clam {Tridacna gigas} Indo-pacific

Juan Carlos Munoz / Fish and shellfish displayed at seafood restaurant, Kota Kinabalu, Sabah, Borneo, Malaysia

GEORGETTE DOUWMA / Small giant clam (Tridacna maxima) in Porites coral. Andaman Sea, Thailand

Georgette Douwma / Crocus giant clam (Tridacna crocea) Rinca, Indonesia

GEORGETTE DOUWMA / Mantle of Small giant clam (Tridacna maxima) Andaman Sea, Thailand

Georgette Douwma / Mantle of Crocus giant clam (Tridacna crocea) Rinca, Indonesia

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) digging for clams on tidal flats, Alaska

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) digging for clams on tidal flats, Alaska

Ingo Arndt / Grizzly Bear (Ursus arctos horribilis) digging for clams on tidal flats, Alaska

Suzi Eszterhas / Grizzly Bear (Ursus arctos horribilis), six to eight month old cub foraging for clams, Katmai National Park, Alaska

Suzi Eszterhas / Grizzly Bear (Ursus arctos horribilis) mother and one and a half year old cub digging for clams, Katmai National Park, Alaska

Suzi Eszterhas / Grizzly Bear (Ursus arctos horribilis) digging for clams, Katmai National Park, Alaska

Steven David Miller / Looking down into the mantle of a Giant clam {Tridacna sp} Great Barrier Reef, Australia

GEORGETTE DOUWMA / Fluted giant clam (Tridacna squamosa) and Fire coral (Millepora sp.), Red Sea, Egypt.

Doug Wechsler / Fisherman collecting Clams on mud flat in estuary, Stone Harbor, Nummy Island, New Jersey, USA

Nature Production / Clam {Pisidium nipponense} with siphon extended, Wakayama, Japan

Nature Production / Pea crab {Pinnotheres sinensis} parasite of Clam {Ruditapes philippinarum} Japan

Tim Edwards / Giant Clam on coral reef (Tridacna sp) Great Barrier Reef, Australia

GEORGETTE DOUWMA / Giant clam feeding {Tridacna gigas} Australia

GEORGETTE DOUWMA / Close up of exhalent syphon of Giant clam {Tridacna gigas} Great Barrier Reef, Queensland, Australia

GEORGETTE DOUWMA / Giant clam {Tridacna gigas} Great Barrier Reef, Australia

GEORGETTE DOUWMA / Close up of inhalent syphon of Giant clam {Tridacna gigas} Great Barrier Reef, Queensland, Australia

GEORGETTE DOUWMA / Giant clam {Tridacna sp} Great Barrier Reef, Australia

GEORGETTE DOUWMA / Giant clam {Tridacna gigas} Great Barrier Reef, Australia

GEORGETTE DOUWMA / Giant clam {Tridacna sp} Great Barrier Reef, Australia

Juergen Freund / Siphon of Giant clam (Tridacna sp) Philippines

Juergen Freund / Detail of Siphon of Giant clam (Tridacna sp) Red Sea

Steven David Miller / Coquina clams (Donax variabilis) small bivalves living just under surface of sand at water line, Florida, USA

Juergen Freund / Juvenile Giant clam (Tridacna sp) held in hand on commerical clam farm, Palau, Micronesia

Juergen Freund / Giant clam (Tridacna sp) in breeding pool on commerical clam farm, Palau, Micronesia

Juergen Freund / Juvenile Giant clams (Tridacna sp) in bucket on commerical clam farm, Palau, Micronesia