I've argued that many of what philosophers call moral sentiments can be seen in other species. In chimpanzees, gorillas, orangutans and humans, you s… - Frans de Waal

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 would say there are people in this world who like hierarchies, they like to keep people in their place, they like law enforcement, and they probably have a lot in common, let's say, with the chimpanzee. And then you have other people in this world who root for the underdog, they give to the poor, they feel the need to be good, and they maybe have more of this kinder bonobo side to them. Our societies are constructed around the interface between those two, so we need both actually.

To endow animals with human emotions has long been a scientific taboo. But if we do not, we risk missing something fundamental, about both animals and us.