It's probably more relevant to compare intraspecies rather than interspecies. And it turns out that human brain volume and intelligence are moderately-highly c

It's probably more relevant to compare intraspecies rather than interspecies. And it turns out that human brain volume and intelligence are moderately-highly correlated [1][2]! [1]: https://pmc.ncbi.nlm.nih.gov/articles/PMC7440690/ https://pmc.ncbi.nlm.nih.gov/articles/PMC7440690/ [2]: https://www.sciencedirect.com/science/article/abs/pii/S0160289604001357?via%3Dihub https://www.sciencedirect.com/science/article/abs/pii/S01602...