> I mean that no other species has the ability to do the same. Dolphins likely can. They're capable of inventing novel tricks, and then communicating the beha

> I mean that no other species has the ability to do the same. Dolphins likely can. They're capable of inventing novel tricks, and then communicating the behavior with a different dolphin, proven by them doing the same new trick in synchrony without either having seen it before. They are also capable of communicating abstract concepts to dolphins in a separate partition of the tank who they can "hear" but not see. We don't know if their language has an equivalent of "sentences", I guess, so you may be technically correct, but I find it hard to imagine a method in which the complex and abstract concepts Dolphins have been shown to communicate only have a single or small finite number of representations. Captive Dolphins can also understand syntax in human sentences. They understand the difference between "get the hoop and then the ball", and "get the ball and then the hoop". And they can generalize this to different concepts and numbers of clauses, and tend to act confused if the sentence is egregiously ungrammatical. They also understand future and past tense, and the difference between a statement and a question. Is it likely that they would understand our language so well if they didn't have something fairly similar of their own, if they hadn't developed language capabilities at a young age? They seemingly have a better ability to understand human language than feral children. Finally, there is evidence that the Shannon entropy of dolphin language is at least 3-4. Human languages are around 8-9, but not enough data has been collected to know that the Dolphin language isn't more complex, and captive Dolphins may have less sophisticated communication than wild ones. In any case, I think even if their language is effectively determined by only 3-4 letter sequences (their "alphabet" is about the same size as English - ~27 whistles) rather than 8-9, that's still complex enough for me to doubt your claim that language capabilities are unique to humans.