There is a lake in Borneo that is home to over one million jellyfish. They've evolved to photosynthesise using algae, providing them with an unlimited supply of food. Subscribe: bit.ly/BBCEarthSub #Jellyfish #OceanSounds #SoundsToRelax Watch more: Planet Earth bit.ly/PlanetEarthPlaylist Blue Planet bit.ly/BluePlanetPlaylist Planet Earth II bit.ly/PlanetEarthIIPlaylist Planet Dinosaur bit.ly/PlanetDinoPlaylist Extra content from Earth's Tropical Islands Three iconic islands. Madagascar. Borneo. Hawaii. Each a contained ecosystem, cut off from the mainland. Rich in extraordinary wildlife and human cultures, these islands are also some of the most fragile places on Earth. 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 entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. This is a c...