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Why don’t we see more larger brained species in our ecosystem?

Why don’t we see more larger brained species in our ecosystem?

Species with larger brains seem to have a higher general intelligence. So why haven’t all species evolved larger brains? Possibly because general intelligence relies on a capability for social learning, so larger brains are only useful for species that rely more on social learning. – Kaj Sotala Larger brains cost require more fuel, larger brains…