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Caution: Ingenious Animals at Work
This 2005 article discusses how "we used to think that humans were the only tool-users. But now chimps, crows -- even dolphins -- have been spotted using them." Describes chimpanzees "clean[ing] themselves with wads of leaves, or us[ing] them like a sponge to soak up water for drinking," green herons using bait while fishing, dolphins carrying sponges to protect their beaks, and more. From the Christian Science Monitor.
http://www.csmonitor.com/2005/0419/p18s02-hfks.html
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