This set contains four NOVA DVDs: Treasures of the Great Barrier Reef, Kingdom of the Seahorse, Shark Attack! and Private Lives of Dolphins. Shark Attack! - Spy on these predators in action and witness a seal's-eye view of an attacking shark. Private Lives of Dolphins - Researchers share their findings regarding dolphins' brainpower, society, evolution and human traits. Kingdom of the Seahorse - Tour the world of the seahorse-from an underwater enclave in Australia (where their mating dance is recorded for the first time) to the apothecaries of Hong Kong, where harvested seahorses feed a steady demand. Treasures of the Great Barrier Reef - The colors and creatures of the undersea world are revealed.