Medary.com

ScienceDaily:

‘On our last trip, we found that bonobos were better cooperators than chimpanzees because they had sex and played a lot. This time we want to see how much thinking is going on behind the cooperation.’

Bonobos, like chimpanzees, are related to humans by 98.7%. But in contrast to chimpanzees who live in male dominated societies, where infanticide and lethal aggression are observed, bonobos live in highly tolerant and peaceful societies due to female dominance that maintains group cohesion and regulates tensions through sexual behaviour.

‘We’re always comparing ourselves to chimpanzees, but they’re only half the picture. Bonobos and chimpanzees are so opposite in many ways, that we really need to understand bonobos if we’re ever going to understand ourselves.’

Well, er, OK, the article didn't exactly talk about "handshakes."   "Daddy and Mommy are 'wrestling.'"