The drink being of a brown colour like that of the Capuchins' robes, the Viennese named it cappuccino in honour of Marco D'Aviano's order.

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In a recent round of experiments, he gave the capuchins a choice between a researcher who shows them one slice and always gives two and a second who shows one and gives one or three.

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In groundbreaking experiments in the late 1990s, Emory professor Frans de Waal showed that capuchins will refuse to "work" if they feel they are getting an unequal share of the rewards.

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Chen was building on research from Emory University's Yerkes National Primate Research Center, which has been working with capuchins for years because of their strong instincts for cooperation and working in groups (in the wild, they eat large squirrels, which require at least two monkeys to capture).

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