What makes us human, I think, is an ability to ask questions, a consequence of our sophisticated spoken language.

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

As thy days, so shall thy strength be.

The problem of the chimps is that they can only sit and look. They can't discuss what they feel. All that feeling is trapped within each one.

The voice of the natural world would be, "Could you please give us space and leave us alone to get along with our own lives and our own ways, because we actually know much better how to do it then when you start interfering."

I am obstinate and I will not give in.

Studying chimps, I came to the conclusion that being evil is something that only humans are capable of. A chimp would never plan to pull another's nails out. The chimps' way of aggression is quick and brutal. I compare them to gang attacks.