Giant clam

Tridacna gigas, commonly known as the giant clam, is the largest living bivalve mollusc, capable of reaching lengths of up to 1.5 meters and weights exceeding 300 kilograms. It inhabits shallow coral reefs of the Indo-Pacific, primarily obtaining nutrients through filter-feeding plankton and from a symbiotic relationship with zooxanthellae algae in its mantle tissues. This sessile creature is diurnal, relying on sunlight for its algal symbionts, and can live for over 100 years in the wild.