Perfectly ordinary terrestrial mammals like elephants have much, much larger skulls at birth than humans, so it’s clearly a matter of tradeoffs not an absolute limit.
Perfectly ordinary terrestrial mammals like elephants have much, much larger skulls at birth than humans, so it’s clearly a matter of tradeoffs not an absolute limit.
Oh of course, but evolution has to work with what it’s got. Humans happened to fit a niche where they might benefit from more intelligence, elephants don’t seemingly fit such a niche.