Has anyone postulated a good theory as to why Homo Sapiens arose in Africa but there were never equivalent (maybe raccoon descended) intelligence-niche species in the new world?
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So it is weird / rare to develop a brain big enough to get near the threshold. The question is not "why didn't raccoons / kangaroos / beavers?" but "why did one species break the otherwise perfect rule that NO ONE develops big brains?"
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