Of course animals have a personality and emotions.

Certainly, if you look at human behavior around the world, you have to admit that we can be very aggressive.

Primates are very territorial. It is in their nature to protect their food resources as well as their females and young.

Louis [Leakey] was anxious to initiate a scientific study of these chimpanzees. It would be difficult, he emphasized, for nothing was known; there were no guidelines for such a field study; and the habitat was remote and rugged. Dangerous wild animals would be living there, and chimpanzees themselves were considered at least four times stronger than humans. I remember wondering what kind of scientist he would find for such a herculean task.

The only possible way to get somebody to change is to reach into their hearts.

I always loved animals. And when I was ten, I decided I had to go to Africa and live with animals and write books about them.

The greatest danger to our future is apathy.