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A wild untrained human animal isn't that bright. We can probably operate above the crow level, but maybe not by much. What makes us special is persistent collective learning and abstract communication. Unlike animals, generations of humans don't have to keep re-solving the same problems. As a species we have cumulative persistent memory for techniques and abstractions. That's the real game changer. But it took a surp…
It seems like you're suggesting that there aren't massive biological differences between a wild human and a crow. This is false. Humans have many biological faculties that crows simply do not have. For example, the wild, untrained human still has the biological faculty of language. That is, there is a reason why no animal other than a human has been shown to be able to learn a language. The reason is that they do not…
_Groups_ of humans with no common means of communication will form pidgins ( https://en.wikipedia.org/wiki/Pidgin ) as an (essentially grammarless) means of communication; children then raised in an environment where they are exposed to this pidgin will transform it into a true language. Nicaraguan Sign Language has actually proven to be a fascinating example of this in action; many of the first speakers of the original pidgin are, now that successive generations have learned and adapted it, unable to competently produce utterances in the now-language.