From a comparative-biological viewpoint, human brain evolution is no exception: arboreal mammals have rel.larger brains than terrestrial ones, and littoral mammals have much larger brains. Since human ancestors evolved from arboreal (often x 2) to
littoral (often x 3), our brain size is about what could be expected for an mammal of our body size.
Google "Ape and Human Evolution 2018 made easy".

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