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Stuart_Armstrong comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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If it looks too different, we won't see them in space, though.
Our own intelligence is at the level where it's just barely sufficient to build a civilization when you got hands, fire, and so on. Note that orcas have much larger brains than humans, and had those larger brains for quite a long time, yet we're where we are, and they're where they are.
Likely because the first beings that could do that, did do that - no need to wait for the evolution of higher intelligence (so, in particular, this doesn't show that higher intelligence couldn't evolve).
Yeah, that's precisely my point. If there's more obstacles, intelligence has to go further before the technological civilization. We did get higher intelligence but only by other means (e.g. having paper and pencil helps, better nutrition gives higher IQ, and so on).