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Giant Clam and Divers

Divers in the Bikini Atoll in the Marshall Islands spot a giant clam (Tridacna gigas) anchored to a coral reef. During the day, the animal's fleshy mantle—which contains green algae—spreads over its open shell to take in sunlight. The sun feeds the algae, which in turn, nourishes the mollusk.

Photograph by Bill Curtsinger