There is a darker side to dolphin communication... Watch as two gangs of male dolphins face off against each other, using synchronised clicks and jaw-clapping to intimidate the other gang. Subscribe: bit.ly/BBCEarthSub #OceanGiants #BBCEarth Watch more: Planet Earth bit.ly/PlanetEarthPlaylist Blue Planet bit.ly/BluePlanetPlaylist Planet Earth II bit.ly/PlanetEarthIIPlaylist Planet Dinosaur bit.ly/PlanetDinosaurPlaylist Ocean Giants, 2011 Dolphins and whales may appear to be totally alien to us. But with their mental ability, group communication and the discovery that dolphins have individual names, they are closer to us than we ever imagined. Ace underwater cameramen Doug Allan and Didier Noirot embark on a quest to film the most amazing stories of whales and dolphins across the ocean world. They uncover new insights into the lives of these extraordinary animals that will redefine how we see them forever. Welcome to BBC EARTH! The world...