The dinosaurs were the serpents. But when the serpent was possessed, from then the serpents has curse with dwarfism of some sort. The caveman were the people. They didn't had knowledge at that time of building homes, they'd used caves as shelter. The people has became barbarians once sin enter into them. Only the ones that still that had the spirit of God in them has mature, but the rest had declined. God chosen the ones that were maturing to do his work. Like Noah, Abraham, Joseph, and Moses; they didn't possessed that tribal mentality like the rest. They'd seem to behaved more civilized than the others.
Numbers 13:30Then Caleb silenced the people before Moses and said, “We should go up and take possession of the land, for we can certainly do it.”
Numbers 14:24But because my servant Caleb has a different spirit and follows me wholeheartedly, I will bring him into the land he went to, and his descendants will inherit it.
Numbers 14:30Not one of you will enter the land I swore with uplifted hand to make your home, except Caleb son of Jephunneh and Joshua son of Nun.