Traveling back then was not much different from dreaming now. You had no idea what was going to happen but you knew that if you kept moving it would keep changing. What I'm saying is once they get started the imagination is inspired and constantly motivated. I think the stepping stones to high intelligence were very rapid for anyone that braved travel. But our darker cousins tended to stay down in the bushes. That is a very uninspiring state. Even if intelligence has put there it will wither