Primate IQ test hails orang-utans as our smartest relatives.
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DeanerR. O., van SchaikC. P.& JohnsonV.Evol. Psychol., 4. 149 - 1496 (2006).
Grand Valley State University, Michigan
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Hopkin, M. It's official: apes outsmart monkeys. Nature (2006). https://doi.org/10.1038/news060731-5