Oceans of the world -- Whales -- Jellyfish -- Sea otters -- Rays -- Sea horses -- Penguins -- Octopuses -- Ocean extremes: Wild wonders -- Coral reefs -- Sea turtles -- Ocean extremes: Bizarre creatures of the deep -- Dolphins -- Crustaceans -- Manatees -- Ocean extremes: Into the unknown -- Marine iguanas -- Walruses -- Sharks -- 20 ways you can protect the ocean -- Layers of life.