Intelligence is based on how efficient a species became at doing the things they need to survive.
Charles DarwinMan is more courageous, pugnacious, and energetic than woman, and has a more inventive genius. His brain is absolutely larger, but whether relatively to the larger size of his body, in comparison with that of woman, has not, I believe been fully ascertained. In woman the face is rounder; the jaws and the base of the skull smaller; the outlines of her body rounder, in parts more prominent; and her pelvis is broader than in man; but this latter character may perhaps be considered rather as a primary than a secondary sexual character. She comes to maturity at an earlier age than man.
Charles DarwinI believe we were all glad to leave New Zealand. It is not a pleasant place. Amongst the natives there is absent that charming simplicity .... and the greater part of the English are the very refuse of society.
Charles Darwin