腦 （扁腦） 珊瑚礁脆弱生態系統的海洋環境。 Koh Haa，泰國甲米。 影片檔

Coral reefs are the one of earths most complex ecosystems, containing over 800 species of corals and one million animal and plant species. Here we see a shallow coral reef consisting mainly of Platygyra Brain Worm Coral. It is a large polyp stony coral and is also referred to as Brain, Maze, Closed Brain, or Bowl Coral. Although on the whole healthy, it is showing signs of distress. 75% of the worlds coral reefs are now classed as 'Threatened,' with 60% of most reefs having local damage from anchors, overfishing, coral bleaching, disease and pollution.