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If you think about it, every single species is endangered. Homo sapiens at the front of the line, mosquitoes and lawyers at the back.

It was both fascinating and appalling to learn that chimpanzees were capable of hostile and territorial behavior that was not unlike certain forms of primitive human warfare.

Chimpanzees have very strong preferences and aversions that are completely personality-linked. The people who are unsuccessful in working with chimpanzees are those who take this personally.

When chimps threaten, they open their mouth and show their teeth. It's a little like waving a knife in front of you. It's very primitive, and therefore bizarre.

You don't know whether chimps are going to kill you or kiss you. They're very open on some levels and much more evil in a certain way.

When it was time to meet a chimpanzee, I got very, very anxious because they have the strength of ten men, so I hear.

There are beautiful examples of art done by chimpanzees in human care.

Chimpanzees, gorillas, orangutans have been living for hundreds of thousands of years in their forest, living fantastic lives, never overpopulating, never destroying the forest. I would say that they have been in a way more successful than us as far as being in harmony with the environment.

Male chimpanzees have an extraordinarily strong drive for dominance. They're constantly jockeying for position.

Endangered species are our friends.