Functionally Referential Communication in a Chimpanzee

@article{Slocombe2005FunctionallyRC,
  title={Functionally Referential Communication in a Chimpanzee},
  author={Katie E. Slocombe and Klaus Zuberb{\"u}hler},
  journal={Current Biology},
  year={2005},
  volume={15},
  pages={1779-1784}
}
The evolutionary origins of the use of speech signals to refer to events or objects in the world have remained obscure. Although functionally referential calls have been described in some monkey species, studies with our closest living relatives, the great apes, have not generated comparable findings. These negative results have been taken to suggest that ape vocalizations are not the product of their otherwise sophisticated mentality and that ape gestural communication is more informative for… 

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