Student or Learner
What do you mean by "they climbed out of the trees"? "when they stopped being an ape"? Is it a metaphor?
ex)When a woman is upset or emotional, she may cry, wave her arms around, and constantly talk using emotional adjectives to describe how she feels. She wants to be mothered, taken care of , and listened to, but a man interprets her behavior based on his own priorities, and he hears her saying, "Save me, fix my problems!"...He saw his father and grandfather behave this way, and this is how men have behaved since they climbed out of the trees....
I've heard 'came out of the trees' and 'climbed down from the trees'. One normally (in Br Eng) climbs out of something that is low down (a car, a laundry basket, a man-hole, a sewer...).