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Within the first few months of life, every bottlenose dolphin invents a unique whistle that becomes its name for the rest of its life — and other dolphins learn that whistle, remember it, and use it t... The proposition that another animal species besides humans uses personal names was, for essentially the entire history of comparative animal cognition https://spacedaily.com/d-within-the-first-few-months-of-life-every-bottlenose-dolphin-invents-a-unique-whistle-that-becomes-its-name-for-the-rest-of-its-life-and-other-dolphins-learn-that-whistle-remember-it-and/