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Author correspondence: Frans B. M. de Waal, Living Links, Yerkes National Primate Research Center, Emory University, Atlanta, Georgia, United States of America. Email: dewaal@emory.edu.
The author thanks Robert Sapolsky and Steve Ross for feedback on an earlier draft.
The author is a longtime board member of ChimpHaven, an NIH-sponsored chimpanzee sanctuary in Louisiana.
The author received no specific funding for this work.
© 2012 Frans B. M. de Waal