Darwin as theory now parish policy

[Rough Rider]

I believe that an early primate of some kind.. came down out of the trees.. learned to walk upright, so as to see over the high grass plains..
At some point learned the use of "tools", then learned to harness the power of fire.. once he was able to cook his meat, and spend his time sitting around the ol' camp fire.. the sky was the limit, just took some time.

now what caused that first primate to come down out of the trees.. I don't know.. divine intervention ? aliens from outer space ?