The late Douglas Adams on dolphins:
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.
Was this, perhaps, an intelligent design?
I got this idea in my head that this is exactly what dolphins were designed to do. That is, they are genetically engineered creatures. A long time ago (10,000 years? 100,000 years? A million years?) a previous civilization on this planet got involved in a conflict and decided they needed some underwater people (beings?) for some kind of work. Exploring maybe, or spying, or maybe even mine detection, and so they created dolphins.
On the other fin, it strikes me as equally plausible that the dolphins may have created us:
Yes, I know there isn’t any evidence of such a thing, but then we don’t have much evidence of anything from a million years ago. There may not have been any people like us, but that’s not to say there weren’t people of some kind out wandering around, picking fights with their neighbors, and cooking up elaborate schemes to do them in.
I’m starting to believe that this is a defining characteristic, once you get about this far [gesticulates] up the food chain.