Even in chimps there is true altruistic behaviour; behaviour that doesn't fit into the sociobiological model that says you either help a close relative and thereby your own genes, or you help somebody else now in return for their help in the future. When a very high-ranking male chimpanzee rescues a little orphan, saving his life, that kind of explanation doesn't work.

One thing I had learned from watching chimpanzees with their infants is that having a child should be fun.

The cheapest and most efficient way of slowing down global warming is to protect and restore the forests, particularly the tropical forests

I wasn't trying to be a scientist. I only ever wanted to be a naturalist, like a David Attenborough.

Especially females and the younger ones like to be with somebody who is wise.

We now know that the structure of the DNA in humans and chimpanzees differs by only just over one percent. You could even have a blood transfusion from a chimp, provided you have the same blood group.

I have found that to love and be loved is the most empowering and exhilarating of all human emotions.