Douglas Adams – The Intelligence of Dolphins

For instance on the planet Earth, man had always assumed he was more intelligent than dolphins because he had achieved so much—the wheel, New York, wars and so on—whilst 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 reasons.

Douglas Adams from So Long and Thanks For All The Fish