Dolphins often synchronize their movements in the wild, such as leaping and diving side by side, but scientists don't know what signal they use to stay so tightly coordinated. Herman thought he might be able to tease out the technique with his pupils. In the film, Akeakamai and Phoenix are asked to create a trick and do it together. The two dolphins swim away from the side of the pool, circle together underwater for about ten seconds, then leap out of the water, spinning clockwise on their long axis and squirting water from their mouths, every maneuver done at the same instant. 'None of this was trained,' Herman says, 'and it looks to us absolutely mysterious. We don't know how they do it--or did it.'

'Minds of their Own'
Virginia Morell
National Geographic
March 2008