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Vaniver comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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I think the more stuff your brain does for you, the more you benefit from any gene that benefits your brain. But is 3-color vision all that different in this regard than 2-color vision? Perhaps not.
I'm not sure about that it seems that the higher up the evolutionary tree you go the more the emphasis shifts from "more senses" to "better use of fewer senses".
Sharks can detect bio-electric fields and minute water vibrations for example.