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.

At some point, my body will collapse. But I hope that my brain will still be working so that I can carry on with writing.

Chimps act the way they feel unless they are afraid of reprisal if they do so. But that doesn't apply to humans.

When you borrow you plan to pay back. We're stealing from our children - so many people have no intention of paying back.

The chimpanzees taught me a lot about nonverbal communication. The big difference between them and us is that they don't have spoken language. Everything else is almost the same: Kissing, embracing, swaggering, shaking the fist.

Mainly because as women's education increases all around the planet, we find that family size tends to drop.

I want to change awareness.