Similarities between laughter of tickled apes and humans mirrors genetic ties between species.
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Davila Ross, M., Owren, M. J. & Zimmermann, E. Curr. Biol. doi:10.1016/j.cub.2009.05.028 (2009).
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Laursen, L. Human-ape links heard in laughter. Nature (2009). https://doi.org/10.1038/news.2009.541