Is intelligence a factor of absolute brain size? The crows say "Nope." How about brain/body ratio? Not really.
Turns out that what you need to be smart is...
...to take longer over developing your brain.
Intelligence is directly related to childhood. To an extended period of development dominated by play. It's true of the crows. It's true of parrots.
And the human brain takes over two decades to fully develop.
We still don't know everything, but if you're going to create an intelligent species, then it might be a reasonable assumption that it will have a long childhood.
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