Bioko and Afar are both good candidates for AAT location


Bioko and Afar are both good candidates for AAT location.  
Arguments for Bioko as opposed to Afar:
1. Bioko was and still is an island, without large predators. An easy place for apes to be isolated suddenly by accident, and a safe place to evolve over a very long time scale, many million years.
2. Bioko is in the range of chimpanzees. The Last Common Ancestor (LCA) of humans and chimpanzees could easily get isolated there, but not in Afar.
3. Humans never got infected by the Simian Immunodeficiency Virus (SIV) which Elaine Morgan called the "Baboon Marker". I think all primates in east and south Africa were exposed to SIV, but not some of the primates in western Africa, and not the ones on Bioko.
4. The sun is always very strong in Afar, but Bioko is almost always cloudy. I think an aquatic ape in Afar would not lose its body hair, which is important for sun protection. 
But again, I agree, that Afar and Bioko are both good possibilities. 

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