Tool use during display behavior in wild cross river gorillas

@article{Wittiger2007ToolUD,
  title={Tool use during display behavior in wild cross river gorillas},
  author={Livia Wittiger and Jacqueline L. Sunderland-Groves},
  journal={American Journal of Primatology},
  year={2007},
  volume={69}
}
During the course of a 3‐year ecological study on Cross River gorillas (Gorilla gorilla diehli) at the Kagwene Mountain in Cameroon, we observed three cases of tool use which may be unique to the gorillas of this region and possibly learned through interactions with humans. A non‐habituated group of Cross River gorillas threw fistfuls of grass toward humans in display contexts. An individual gorilla was also observed to throw a detached branch toward researchers during another encounter. The… 

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