David Fleetham / Opening in the mantle of Giant clam (Tridacna gigas) Tubbataha Reef, Philippines.

Constantinos Petrinos / Giant clam {Tridacna gigas} biggest bivalve species in world, Sulawesi Indonesia. Hermaphrodite producing both eggs and sperm

Steven David Miller / Tombstone for 200 Giant clams (Tridacna gigas) illegally harvested in and around Evans Shoal, Darwin. Northern Territory, Australia. 2017.

Jordi Chias / Table coral (Acropora) with Giant clams (Tridacna gigas) Addu Atoll, Maldives, Indian Ocean.

Pascal Kobeh / Diver near Giant clams (Tridacna gigas) some of which are dead, Palau. Philippine Sea. April 2010.

Pascal Kobeh / Diver behind Giant clams (Tridacna gigas) Manado, Indonesia. Sulawesi Sea. May 2010.

Franco Banfi / Scuba diver with giant clam (Tridacna gigas) Raja Ampat, Irian Jaya, West Papua, Indonesia, Pacific Ocean, vulnerable species.

Claudio Contreras / Giant clam (Tridacna sp.) on reef, Bilang Bilangang Island, Danajon Bank, Central Visayas, Philippines, April

Juergen Freund / Giant clam (Tridacna gigas) in the shallows Raja Ampat, West Papua, Indonesia

Franco Banfi / Giant clam (Tridacna sp.) Maldives, Indian Ocean

Michele Westmorland / Giant clam detail (Tridacna sp), Palau, Micronesia.

Michele Westmorland / Giant clam detail (Tridacna sp), Palau, Micronesia.