Female long-tailed macaques have been observed flossing their teeth with human hair. While interesting, the most exciting part is that the monkeys spend twice as much time flossing when their infants are watching, suggesting they are deliberately teaching the offspring to floss.
Experts noted the research is only in the "hypothesis stage," but teaching tool-using techniques to others is a practice thought inherent only to humans.
© C Harris Lynn, 2009
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