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timtyler comments on How inevitable was modern human civilization - data - Less Wrong
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Mosst animals make very little use of tools. The (highly brainy) Cetaceans don't seem to use them at all.
More important theories inculude the social brain hypothesis - and sexual selection.
Dolphins have been confirmed as tool-users. For example they are known to use sticks and kelp in mating displays and games.
Cool. An example:
http://news.nationalgeographic.com/news/2005/06/0607_050607_dolphin_tools.html