They didn't crawl out of the caves, Chongo, Homo Erectus stood up (And what was the "scientist" who came up with that name thinking about?) banged his head on a stalactite and staggered out into the natural world, brain-injury and all. It's been all downhill since then, which has been good for the "Homeless Sapients", because they can't climb worth a crap...

And Musket, you humans lie about conception all the time. So don't drag me into that ongoing fight between your mother and "father", I'm a bonobo, dammit, A BONOBO!