Ants are some of the most social creatures on the planet. And they do have big eyes. Is Oxford evolving towards a huge ant-heap (steered by the ultimate racist/sexist totalitarian social tool Sharia)?!
There's a childish proposal, eagerly consumed by stupid media, that Neanderthals died out because they used too much of their brains for vision. And Klevius is eagerly waiting for John Hawks' comment on it.
Moreover, to understand why the whole concept of "vision areas in the brain" is complete nonsense please do read EMAH (The Even More Astonishing Hypothesis). The "vision area" could be used to whatever. Moreover, vision isn't "vision" in any particular sense but just part of information which together with all saved information results in an awareness tied to the immediate now that we tend to call "vision".
One eye of the Tarsier above is the size of its entire brain. So what about the one to the right?
Professor Chris Stringer: 'Our study provides a more direct approach by estimating how much of their brain was allocated to cognitive functions, including the regulation of social group size; a smaller size for the latter would have had implications for their level of social complexity and their ability to create, conserve and build on innovations.'
Professor Robin Dunbar: ‘Having less brain available to manage the social world has profound implications for the Neanderthals’ ability to maintain extended trading networks, and are likely also to have resulted in less well developed material culture – which, between them, may have left them more exposed than modern humans when facing the ecological challenges of the Ice Ages.’
Klevius tired and yawning comment: Floresiensis!
Btw, if "friendship" had been a factor in the hunting gathering groups based on kinship before civilization then they would have instead gathered armies. And that's precisely what we have seen, namely a striking lack of organized hunter-gather armies. Who would have been a "friend" in the sparsely populated community where everyone was already related? Rapes and other attacks on lonely individuals or small groups certainly occured but organized warfare is a very late invention. Actually much later than the peak of human intelligence.
Alternatively, we need to re-conceptualize 'hunter-gather' or 'friendship'.