A school of Humphead Parrotfish descend on the coral reef to feed and turn the age old coral into a fine sand that, in turn, forms islands. Fascinating video from BBC natural history show Blue Planet. Narrated by Sir David Attenborough. Subscribe: http://bit.ly/BBCEarthSub Taken From Blue Planet. WATCH MORE: New on Earth: https://bit.ly/2M3La96 Oceanscapes: https://bit.ly/2Hmd2kZ Wild Thailand: https://bit.ly/2kR7lmh Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. This is a commercial channel from BBC Studios. Service & Feedback https://www.bbcstudios.com/contact/contact-us/