Pretty scary stuff once you saw "Planet of the apes". But very interesting read.
I got a bit lost with your distinction between West and Central, never really knowing what was the point. Ok, the 2 are different, but what's outstanding is that one actually hunt with fucking spears!
My point with the distinction between West and Central was to show that the current subspecies categories that have been constructed may be superficial and inaccurate. It appears as though the central and eastern subspecies are very similar genetically and behaviourally - but the western chimpanzee is genetically distinct and exhibits a different suite of behaviours. I remember when I first heard about the Fongoli chimps - it really is incredible insight into our own evolution. I don't think it is a coincidence that a population of chimps adapted to a savannah (like our ancestors were) start to develop similar technologies to our ancient hominid ancestors.