Dr. Frans de Waal discusses his observations of chimps and bonobos and how they relate to human behavior in this interview:
"I call the human species the most bipolar ape, meaning that we go beyond chimps in our violence, which is systematic and often results in thousands of dead, and we go beyond the bonobo in our empathy and love for others, so that human altruism is truly remarkable. However, both bonobos and chimpanzees also know these inner contradictions. They, too, are bipolar. Chimpanzees have the capacity to make peace and share food with each other, and bonobos can be quite nasty to each other."