What happens when you pay two monkeys unequally?

Two Monkeys Were Paid Unequally: Excerpt from Frans de Waal’s TED Talk

What happens when you pay two monkeys unequally? Watch what happens.
An excerpt from the TED Talk: “Frans de Waal: Moral behavior in animals.” Watch the whole talk here: http://www.ted.com/talks/frans_de_waal_do_animals_have_morals.html

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