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Azathoth123 comments on The Octopus, the Dolphin and Us: a Great Filter tale - Less Wrong
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It's not clear why color vision is necessary for intelligence. In any case most vertebrates have (at least) three color vision. In most mammals this was reduced to two but in primates a mutation increased this to three. So its not like three color vision is hard to evolve.
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.