“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.” Douglas Adams, "The Hitchhiker's Guide to the Galaxy."
Yes and Dolphins don't kill us over stupid things like parking spaces or out of jealousy. We, however kill dolphins with fish nets and in Japan) if they are competitions for fishing grounds. Obviously they are the superior ones.