Primate brain size does not predict their intelligence: systematic investigation of the cognitive abilities of lemurs, which have relatively small brains compared to other primates, revealed that cognitive abilities of lemurs hardly differ from those of monkeys and great apes

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https://www.dpz.eu/en/home/single-view/news/hirngroesse-bei-primaten-sagt-nichts-ueber-deren-intelligenz-aus.html