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Early-Pleistocene shellfish collection (rich in DHA etc.) best explains Pleistocene Homo's brain expansion, as well as their intercontinental diaspora, as far as SE.Asia, including a lot of islands.

Archaic Homo, who had learnt to use stone tools for removing & opening shellfish, also used these tools for trying to get some bone marrow from waterside carcasses from what was left over by crocodiles, hyena, rodents & vultures. These stones & bones
leave a lot of archeological traces, whereas fish, shellfish eaten in situ & plant foods don't.

If Pleistocene Homo had been hunters, as sometimes still assumed, we had had a keen olfaction.
Our poor sense of smell shows that our Pleistocene ancestors got most of their foods from the water.

Google
"coastal dispersal Pleistocene Homo 208 biology vs anthropocentrism"

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