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Giant Clams  Photograph by Sami Sarkis/Getty Images    The largest mollusks on Earth, adult giant clams permanently affix themselves to surfaces such as sand or coral reef rubble. The behemoths are capable of reaching 4 feet (1.2 meters) long and weighing more than 500 pounds (227 kilograms). They can live a hundred years or more in the wild.

Giant Clams is the largest mollusks on Earth. The behemoths are capable of reaching 4 feet meters) long and weighing more than 500 pounds kilograms). They can live a hundred years or more in the wild.