JoshuaZ comments on How minimal is our intelligence? - Less Wrong
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Even if it is an increase proportional to the population, that still means that a model where increased technology (which allows a larger population) is responsible for further increases. So the upshot is still the same, which is that it is highly plausible in that context that other species had enough intelligence to make civilization but never got the first few lucky technologies.
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And cue the Douglas Adams reference.
I have to wonder how much dolphin anatomy factors into their apparent lack of civilization-building. Then again, I haven't read anything about dolphins developing anything like agriculture (whereas some social insects seem to manage some impressive achievements, such as ants domesticating other insects, farming fungi, and building vast inter-connected colonies). Yet it seems pretty clear that social insects are nothing like intelligent in the way that primates and dolphins are.
Well, there is the complex hunting behavior, and indications of limited tool use. Why is agriculture special?