small/short people, dwarfs have sometimes small heads, homo floresiensis was small, birds have very small heads but prooven denser brain structure.
science is "surprised" for example that floresiensis (hobbit) made tools but i can't find any source (as well as personal experience) that small people with small heads are less intelligent.
Also, we know that domestication if animals reduces their brain volume and it is thought to be connected with aggressivity and general defence of tweritory or dominance.
Also we have some people apparently functioning totally normal with half a brain.

my question is, aren't we still totally misinterpreting size with function? Is that already somewhere in literature?
I mean just that aspect of volume, density and mental capacity?