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Also, I wonder if the relatively low abundance of panins makes them difficult to discover. Let's not forget that gorillas--living, breathing giant animals, not fossils--were only discovered in the mid19th c. And the modern Bonobo only exists in remote areas of the Congo, if I'm not mistaken. Could it be possible that our common ancestor was equally isolated, and it wasn't until hominids could exit the jungle on foot that they became wide spread?