FIGURE 1. Japanese monkey washing potatoes.

From the following article:

Cultural primatology comes of age

Frans B. M. de Waal

Nature 399, 635-636(17 June 1999)

doi:10.1038/21310

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About half a century ago, a juvenile Japanese macaque developed sweet-potato washing on the island of Koshima. The habit spread to the rest of the population. None of these monkeys is still alive today, but their descendants are still washing potatoes.

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