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Humans are able to reflect and comment on the nature of their own communication. This ability has never been documented in any other species, neither in the wild nor after extensive training in the experimental laboratory.

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  1. The function and mechanism of vocal accommodation in humans and other primates., Ruch, Hanna, Zürcher Yvonne, and Burkart Judith M. , Biol Rev Camb Philos Soc, 2018 05, Volume 93, Issue 2, p.996-1013, (2018)