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It is of interest to note that while some dolphins are reported to have learned English - up to fifty words used in correct context - no human being has been reported to have learned dolphinese.
I reckon they just haven't tried. Have you? I know I haven't.
Now that you mention it Jacob ... Although, in fairness, I believe many dolphin researchers are barmy enough to have attempted to, and no doubt claim to have succeeded, in learning dolphinese.