Yes to a first approximation this is a good heuristic! https://en.wikipedia.org/wiki/Brain%E2%80%93body_mass_ratio https://en.wikipedia.org/wiki/Brain%E2%80%93

Yes to a first approximation this is a good heuristic! https://en.wikipedia.org/wiki/Brain%E2%80%93body_mass_ratio https://en.wikipedia.org/wiki/Brain%E2%80%93body_mass_ratio https://en.wikipedia.org/wiki/Encephalization_quotient https://en.wikipedia.org/wiki/Encephalization_quotient