Why are humans the only species on earth to become intelligent?
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Evolution tends to favour quick wins, like physical or behavioural adaptations. Human level intelligence requires so much energy it took a very specific set of circumstances and environmental conditions to arise. Once it did it’s obvious evolutionary benefits became a huge selective pressure, where even slight improvements allowed one set of proto-humans to out compete others. Rinse and repeat for hundreds of thousands of years an we are all that’s left.
If you look at the animals closest to us in intelligence, they tend to be in environments where humans don’t thrive (oceans and jungles) so we weren’t able to out compete them as easily, at least until our technology improved
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