Why kids climb trees

I was just thinking about a theory I have about human beings as children and why they have a prevailing desire to climb trees.  I promise there is a relevant point in here somewhere.

A few years ago I started thinking about how kids always seem to be climbing things, and I think it is a hold over from our recent eveolutionary ancestors.  If you think about it, chimpanzees sleep in trees and use elevation to escape from predators.  I believe the desire to climb, especially as a child, is inbourne and necessary to a child's natural ability to survive.  Human legs take longer to develope than their arms, so naturally climbing seems a more resonable response to the threat of predation than running. 

However, and here's my point, even before we can climb we can cry.  While climbing may appear to be the first line of defence, it's not.  We come out screaming.  Crying is therefore the first form of communication humans are equipt with, and strangely wailing is a completely unconscious behavior.  As a child all one has do to communicate a desire is cry.  "I'm hungry. I'm tired. etc." Cry, cry, cry. But when does physical and cognitive ability kick in and make desire of and being given the desired not enough?

As far as I know, science still can't explain how humans develope in terms of speech formation.  There are theories as far as cognitive function being a product of emulation, but the maze that is our brain starts the process of langauge formation unconsciously.  Incidently, some of what Dr. Sexon has been saying is finally sinking in, because to learn we must remember and that means we are remembering things before we are conscious of it.  The pursuit of memories we made before those in our present consciounsess allows us to remember seems interesting, but I think in order to remember those things we would have to de-evolve our brains back to the state of the lost memories.  I think there is probably a connection somewhere that we all have, and that once connected won't allow us to regress. I would guess the key connection resides somewhere between all the senses and the unconscious. 

I just want to add what an older friend of mine told me about drinking alcohol.  He said that people unconsciously desire to be children again, and that drinking basically reduces your cognitive ability to that of a six year old.  I think he may have been on to something...