Let me add yet another reference: Robert Merle's "the day of the dolphin" (un animal doué de raison) published in 1967 (so the navy began training dolphins and

Let me add yet another reference: Robert Merle's "the day of the dolphin" (un animal doué de raison) published in 1967 (so the navy began training dolphins and sea lions while reading this book). In it, the (talking) dolphins are used in a false flag attack.