Man has always assumed that he was more intelligent than dolphins because he had achieved so much...the wheel, New York, wars and so on...while all the dolphins had ever done was muck about in the water having a good time. But conversely, the dolphins had always believed that they were far more intelligent than man...for precisely the same reason.
I suspect the dolphins are on to something
How do they do it?
Several months ago, curators noticed a bottlenose dolphin at Dolphin Cove had learned to expel air from its blowhole. With a flick of its head, the dolphin then created a circle of air -- a silvery bubble ring. Curators then saw the dolphin using its rostrum (the "bottlenose" part) to twist, spin and re-shape the ring, sometimes biting a bigger ring to make a smaller one.Full article found here.