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.

There isn't a sharp line dividing humans from the rest of the animal kingdom. All the time, we find animals doing things that, in our arrogance, we thought were just human.

You better not mess with chimps. They are much stronger than humans.

A chimp would never plan to pull another's nails out.

Anyone who tries to improve the lives of animals invariably comes in for criticism from those who believe such efforts are misplaced in a world of suffering humanity.

They used to ask: "How will this decision that we make today affect our people in the future?" Now we make decisions based on: "How does it affect me, now? How does it affect the next shareholders meeting, three months ahead? How does it affect my next political campaign?"

Every individual matters. Every individual has a role to play. Every individual makes a difference.