http://bonobohandshake.blogspot.com/2007/09/bonobos-drool-for-tory.html
i like this one better than the cannibalism story...
Peter Pan ways make bonobos the most amiable of apes
Bonobos are the Peter Pans of the jungle. The amiable apes hold onto their youthful ways far longer into adulthood than chimpanzees, while some childish traits never vanish, a new study shows.
This difference may explain why bonobos are less aggressive and more social than chimps, says Victoria Wobber, a primatologist at Harvard University...
http://www.newscientist.com/article/dn18443-peter-pan-ways-make-bonobos-the-most-amiable-of-apes.html