"It is true that the chimpanzee is dominance-oriented, violent, territorial. But it's also cooperative in many ways, and so that side is sometimes forgotten. The bonobo is sensual, sensitive, sexual, a peacemaker, but also can have a nasty side, and that's sometimes forgotten. So both species are sort of the ends of the spectrum, and we fall somewhere in between. Clearly, we have both of these sides in us, and that's why I sometimes call us "the bipolar apes."

“I first saw them in 1978. At the time, I knew a lot about chimps, because I had been studying them. I saw the bonobos at a zoo in Holland, and I thought immediately, they're totally different. The sense you get looking them in the eyes is that they're more sensitive, more sensual, not necessarily more intelligent, but there's a high emotional awareness, so to speak, of each other and also of people who look at them.”

“In 1879, American economist Francis Walker tried to explain why members of his profession were in such "bad odor amongst real people". He blamed it on their inability to understand why human behavior fails to comply with economic theory. We do not always act the way economists think we should, mainly because we're both less selfish and less rational than economists think we are. Economists are being indoctrinated into a cardboard version of human nature, which they hold true to such a degree that their own behavior has begun to resemble it. Psychological tests have shown that economics majors are more egoistic than the average college student. Exposure in class after class to the capitalist self-interest model apparently kills off whatever prosocial tendencies these students have to begin with. They give up trusting others, and conversely others give up trusting them. Hence the bad odor.”

“At the time, I was interested in reconciliation after fights, and I wanted to know how bonobos did it compared to chimpanzees. Very soon I discovered that they were much more sexual in everything they did, and that interested me — not so much for the sex part, even though that became a very hot topic, the peacemaking-through-sex thing — but much more how they have such a peaceful society, because they are much less violent than chimpanzees.”

“Don’t believe anyone who says that since nature is based on a struggle for life, we need to live like this as well. Many animals survive not by eliminating each other or by keeping everything for themselves, but by cooperating and sharing. This applies most definitely to pack hunters, such as wolves or killer whales, but also our closest relatives, the primates. In a study in Taï National Park, in Ivory Coast, chimpanzees took care of group mates wounded by leopards, licking their blood, carefully removing dirt, and waving away flies that came near the wounds. They protected injured companions, and slowed down during travel in order to accommodate them. All of this makes perfect sense given that chimpanzees live in groups for a reason, the same way wolves and humans are group animals for a reason. If man is wolf to man, he is so in every sense, not just the negative one. We would not be where we are today had our ancestors been socially aloof. What we need is a complete overhaul of assumptions about human nature. Too many economists and politicians model human society on the perpetual struggle they believe exists in nature, but which is a mere projection. Like magicians, they first throw their ideological prejudices into the hat of nature, then pull them out by their very ears to show how much nature agrees with them. It’s a trick for which we have fallen for too long. Obviously, competition is part of the picture, but humans can’t live by competition alone.”

“The possibility that empathy resides in parts of the brain so ancient that we share them with rats should give pause to anyone comparing politicians with those poor, underestimated creatures.”

“Imagine that we didn't know the chimpanzee, that all we knew were those bonobos who have sex all the time and are peaceful and female-dominated and that people would say that this is our only close relative. I think we would have totally different theories about ourselves and our background. But, of course, it didn't happen that way.”