Chimpanzees are incredibly intelligent. They can learn more than 400 signs of American Sign Language. They have memories for spatial distribution, like numbers on a TV screen, way better than ours. You come onto the emotions: happiness, sadness, fear, and despair - all the things for which I was accused of being anthropomorphic when I ascribed them to chimpanzees.

The best relationship you can have with a chimpanzee is total mutual trust.

I have never had an animal that didn't have a personality, one differing from another.

Animals were my passion from even before I could speak apparently. When I was about 10, 11 I fell in love with Tarzan.

I got to Africa. I got the opportunity to go and learn, not about any animal, but chimpanzees. I was living in my dream world, the forest in Gombe National Park in Tanzania. It was Tanganyika when I began.

If you catch somebody doing something wrong, he will just cringe away and curl up. He will not listen anymore. Instead, he will think of how he can counterattack.

Hundreds and thousands of young people around the world can break through and can make this a better world for all living things. Once young people know the problems and are empowered to act, they have great power to impact the world.