Okay, brain:body ratio has nothing to do with intelligence. This was science we were taught 30 years back. It’s outdated. Insects are the highest in this, and they’re at the bottom of the food chain. I don’t know why humans are different from all other species that roam the earth because I’m not a scientist. Ask one of them why. We have no idea why women are more intelligent than men either. It’s a recent found, proved by Gen Z women in their 20’s. Again, other species don’t form civilisations the way humans do. So, it cannot be compared.