Summary

When you swim through the azure waters of the Great Barrier Reef, there is one creature on the seafloor that's almost impossible to miss: the giant clam. Its huge, fluted shell frames a soft mantle shimmering with electric blue, green and gold. As the world's largest living bivalve, Tridacna gigas can reach 1.2 meters (4 feet), weigh more than 200 kilograms (440 pounds) and live for over a century.

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