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

If you look at human society, it is very easy, of course, to compare our warfare and territoriality with the chimpanzee. But that's only one side of what we do. We also trade, we intermarry, we allow each other to travel through our territory. There's an enormous amount of cooperation. Indeed, among hunter-gatherers, peace is common 90 percent of the time, and war takes place only a small part of the time. Chimps cannot tell us anything about peaceful relations, because chimps have only different degrees of hostility between communities. Whereas bonobos do tell us something; they tell us about the possibility of having peaceful relationships.

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.

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.