The part that always shocked me was the inter-community violence among the chimps: the patrols and the vicious attacks on strangers that lead to death. It’s an unfortunate parallel to human behavior – they have a dark side just as we do. We have less excuse, because we can deliberate, so I believe only we are capable of true calculated evil.

We have language and they do not. Chimps communicate by embracing, patting, looking – all these things. And they have lots of sounds. But they cannot sit and discuss. They cannot teach about things that are not present, as far as we know.

I love to go to the zoo. But not on Sunday. I don’t like to see the people making fun of the animals, when it should be the other way around.

It is not part of a true culture to tame tigers, any more than it is to make sheep ferocious.

When you meet chimps you meet individual personalities. When a baby chimp looks at you it’s just like a human baby. We have a responsibility to them.

On the day-long follows that I used to do with mothers and their offspring – these chimp families that I knew so well – there was hardly a day when I didn’t learn something new about them.

No matter what cause one defends, it will suffer permanent disgrace if one resorts to blind attacks on crowds of innocent people.

What an ugly beast the ape, and how like us.

People say maybe we have a soul and chimpanzees don’t. I feel that it’s quite possible that if we have souls, chimpanzees have souls as well.

Human language appears to be a unique phenomenon, without significant analogue in the animal world.

With those attacks, the terrorists and their supporters declared war on the United States. And war is what they got.

No matter how much cats fight, there always seem to be plenty of kittens.

Every aspect of human technology has a dark side, including the bow and arrow.

Some kinds of animals burrow in the ground; others do not. Some animals are nocturnal, as the owl and the bat; others use the hours of daylight. There are tame animals and wild animals. Man and the mule are always tame; the leopard and the wolf are invariably wild, and others, as the elephant, are easily tamed.

There’s certainly a side of me that isn’t completely… sane. Or completely ‚even‘ all the time. We all have our dark sides.

I don’t mind telling a dark side.

Even an animal, if you show genuine affection, gradually trust develops… If you always showing bad face and beating, how can you develop friendship?

Chimps are very quick to have a sudden fight or aggressive episode, but they’re equally as good at reconciliation.

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.

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.

I sometimes have a tendency to walk on the dark side.

In Tanzania, the chimps are isolated in a very tiny patch of forest. I flew over it 13 years ago and realized that, basically, all the trees had gone, that people all around the park are struggling to survive. It became very clear that there was no way to protect the chimps while the people were in this dire circumstance.

‚In Utero‘ was the first time I’d made an album that reached into the dark side. I remember the conflict and the uncertainty. I remember all those things when I hear ‚Pennyroyal Tea.‘

The world is full of people with different characters and temperaments. We all have a dark side, a tendency to manipulate, and aggressive desires. The most dangerous types are those who repress their desires or deny the existence of them, often acting them out in the most underhanded ways.

I thought my life was mapped out. Research, living in the forest, teaching and writing. But in ’86 I went to a conference and realised the chimpanzees were disappearing. I had worldwide recognition and a gift of communication. I had to use them.

It seems strange that bears, so fond of all sorts of flesh, running the risks of guns and fires and poison, should never attack men except in defense of their young. How easily and safely a bear could pick us up as we lie asleep! Only wolves and tigers seem to have learned to hunt man for food, and perhaps sharks and crocodiles.

Man is a clever animal who behaves like an imbecile.

The deliberate and deadly attacks which were carried out yesterday against our country were more than acts of terror. They were acts of war.

When you’re thirteen and listening to punk, the aggressive nature of music can sway you to the dark side.

The chimpanzee study was – well, it’s still going on, and I think it’s taught us perhaps more than anything else to be a little humble; that we are, indeed, unique primates, we humans, but we’re simply not as different from the rest of the animal kingdom as we used to think.

In the wake of the events of 11 September 2001, it now seems clear that the shock of the attacks was exploited in America.

Chimps can do all sorts of things we thought that only we could do – like tool-making and abstraction and generalisation. They can learn a language – sign language – and they can use the signs. But when you think of our intellects, even the brightest chimp looks like a very small child.

A black cat crossing your path signifies that the animal is going somewhere.

It was because the chimps are so eye-catching, so like us and teach us so much that my work was recognised worldwide.

I learned from my dog long before I went to Gombe that we weren’t the only beings with personalities. What the chimps did was help me to persuade others.

I miss the early days; I do. I was so lucky. I basically had it to myself, learning about these chimpanzees. Nobody knew anything about them. Discovering their different personalities, different life histories. I was lucky.

I got to Africa. I got the opportunity to go and learn, not about any animal, but chimpanzees. I was living in my dream world, the forest in Gombe National Park in Tanzania. It was Tanganyika when I began.

There are many people who feel that it is useless and futile to continue talking about peace and non-violence against a government whose only reply is savage attacks on an unarmed and defenseless people.

It disturbs me no more to find men base, unjust, or selfish than to see apes mischievous, wolves savage, or the vulture ravenous.

We’re the only animal that wakes up and doesn’t stretch.

Owners of dogs will have noticed that, if you provide them with food and water and shelter and affection, they will think you are God. Whereas owners of cats are compelled to realize that, if you provide them with food and water and affection, they draw the conclusion that they are God.

Primate and elephant and even pig societies show considerable evidence of care for others, parent-child bonding, solidarity in the face of danger, and so on.

Bears are very nice, as long as you are nice to them.

Nixon represents that dark, venal and incurably violent side of the American character almost every other country in the world has learned to fear and despise.