Bonobos, cousins of chimps and humans, would rather see other Bonobos, a Duke University researcher found. Brian Hare and his colleagues discovered that bonobos will invite a stranger to share food, while ignoring a known acquaintance entirely. The deal only works, however, if the bonobo shares. If he/she doesn’t get any food from the deal, that bonobo won’t share. This video shows some early bonobo sharing research; the new study appears in the January 2 PLoS ONE.
Source: Duke University.