Look inside a Coral ReefDiscover a vivid underwater world of bright coral and fascinating sea creatures. Open the flaps and peer among spectacular coral shapes to see a magical world of sea creatures living in a reef. From turtles, fish, and sharks to octopus, sponges, and sea horses, explore the diversity of marine life. Find out what coral is and how a reef forms, and discover the threat to all coral reefs from warming oceans and pollution. Look inside a Coral Reef by