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Frilled Shark: Humans rarely encounter them. They remain in the oceans' depths, up to 5,000 ft below. Frilled sharks are similar to ancestors from the time of dinosaurs. This 5.3-ft specimen was found in shallow water in Japan, 2007, transferred to a marine park, and died hours later.
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.