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.

Be assured that our individual actions, collectively, make a huge difference.

My mother always taught us that if people don't agree with you, the important thing is to listen to them. But if you've listened to them carefully and you still think that you're right, then you must have the courage of your convictions.

I became intensely aware of the being-ness of trees. The feel of rough sun-warmed bark of an ancient forest giant, or the cool, smooth skin of a young and eager sapling, gave me a strange, intuitive sense of the sap as it was sucked up by unseen roots and drawn up to the very tips of the branches, high overhead.

If you consciously say 'I won't do it!' to yourself, then you have a good chance that you won't.

It's not that humans and non-humans are identical... but the lack of understanding that led to the slave trade is the same lack of understanding many people have about animals today. When slaves were brought over from Africa, many people believed they were not humans, that they didn't have feelings. Many people believe that primates and other animals don't have feelings, too, but they do.

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