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.

My mother always used to say, 'Well, if you had been born a little girl growing up in Egypt, you would go to church or go to worship Allah, but surely if those people are worshipping a God, it must be the same God' - that's what she always said. The same God with different names.

For those who have experienced the joy of being alone with nature there is really little need for me to say much more; for those who have not, no words of mine can ever describe the powerful, almost mystical knowledge of beauty and eternity that come, suddenly, and all unexpected.

I had never been able to believe that God would give us poor frail humans only one chance at making it -- that we would be assigned to some kind of hell because we failed during one experience of mortal life. ... So the concepts of karma and reincarnation made logical sense to me.

I see that within each human being there are two extremes: there's the loving, the passionate, altruistic side that has evolved with us, and then there's the violent, brutal side that has evolved with us. The question for each individual is: which side is going to come out on top?

I've got different ideas of complete happiness. But one is being by myself out in a forest, completely happy. Another is walking with a dog in some nice place. And three is sitting around preferably a fire, but not necessarily, and drinking red wine with friends and telling stories.

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.

I get upset when so many people say there are all sorts of problems in Africa and India where they have these big families. They don't realize that 10 children in rural Tanzania will use less natural resources in a year than one middle class American child. People don't think like that.

There are certain characteristics that define a good chimp mother. She is patient, she is protective but she is not over-protective - that is really important. She is tolerant, but she can impose discipline. She is affectionate. She plays. And the most important of all: she is supportive.

Chimpanzees, gorillas, orangutan shave 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.

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.

Whatever we believe about how we got to be the extraordinary creatures we are today is far less important than bringing our intellect to bear on how do we get together now around the world and get out of the mess that we've made. That's the key thing now. Never mind how we got to be who we are.

Certainly the first true humans were unique by virtue of their large brains. It was because the human brain is so large when compared with that of a chimpanzee that paleontologists for years hunted for a half-ape, half-human skeleton that would provide a fossil link between the human and the ape.

It has actually been suggested that warfare may have been the principle evolutionary pressure that created the huge gap between the human brain and that of our closest living relatives, the anthropoid apes. Whole groups of hominids with inferior brains could not win wars and were therefore exterminated.

When I look back over my life it's almost as if there was a plan laid out for me - from the little girl who was so passionate about animals who longed to go to Africa and whose family couldn't afford to put her through college. Everyone laughed at my dreams. I was supposed to be a secretary in Bournemouth.

...it honestly didn't matter how we humans got to be the way we are, whether evolution or special creation was responsible. What mattered and mattered desperately was our future development. Were we going to go on destroying God's creation, fighting each other, hurting the other creatures of the His planet?

Chimps are unbelievably like us - in biological, non-verbal ways. They can be loving and compassionate and yet they have a dark side... 98 per cent of our DNA is the same. The difference is that we have developed language - we can teach about things that aren't there, plan for the future, discuss, share ideas

Chimps are brutal, and it is so deliberate. The males go out and get near the boundary of their territory. And they walk very silently trying hard not to make any noise. They will climb into a tree and stare out over hostile territory for hours. They are waiting for the right opportunity. And then they attack.

I think my message to the politicians who have within their power the ability to make change is, 'Do you really, really not care about the future of your great-grandchildren? Because if we let the world continue to be destroyed the way we are now, what's the world going to be like for your great-grandchildren?'

We have to create more and more vegetarians, and help people to understand that it is not only the suffering of the animals (which is what made me vegetarian) but also the incredible harm to the environment, the tremendous amount of greenhouse gas created by the whole vast machinery of intensive animal farming.

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.

I don't think anybody has the right to a huge family. There's already more people on the planet than our natural resources can even support, and if everybody were to have a high standard of living, we need three or four or five new planets to provide the resources. And this cannot be, so something has to change.

I was brought up to understand Darwin's theory of evolution. I spent hours and hours in the Natural History Museum in London looking at the descriptions of how different kinds of animals had evolved, looking at the sequence of fossil bones looking gradually more and more and more and more like the modern fossil.

If you look into their [chimpanzees] eyes, you know you're looking into a thinking mind. They teach us that we are not the only beings with personalities, minds capable of rational thought, altruism and a sense of humor. That leads to new respect for other animals, respect for the environment and respect for all life.

I feel a desperation to make people see what we are doing to the environment, what a mess we are making of our world. At this point, the more people I reach, the more I accomplish. ... I miss Gombe and my wonderful years in the forest But if I were to go back to that, I wouldn't feel I was doing what I should be doing.

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.

Just think of the trust that often exists in soldiers. Within their own unit, you could say they have to trust each other. A spirit of camaraderie builds up and, in the end, they will risk their lives for each other. They may even go so far as to dehumanise the other, enemy group - a mechanism you can also observe in chimps.

And I thought how sad it was that, for all our sophisticated intellect, for all our noble aspirations, our aggressive behavior was not just similar in many ways to that of the chimpanzees - it was even worse. Worse because human beings have the potential to rise above their baser instincts, whereas chimpanzees probably do not.

When I was 10 years old, I loved - I loved books, and I used to haunt the secondhand bookshop. And I found a little book I could just afford, and I bought it, and I took it home. And I climbed up my favorite tree, and I read that book from cover to cover. And that was Tarzan of the Apes. I immediately fell in love with Tarzan.

In what terms should we think of these beings, nonhuman yet possessing so very many human-like characteristics? How should we treat them? Surely we should treat them with the same consideration and kindness as we show to other humans; and as we recognize human rights, so too should we recognize the rights of the great apes? Yes.

I just have this absolute belief that humans are moving away from cruelty and destruction towards a time when we can truly live in harmony with nature. When we understand that there is a spiritual power around us from which we can draw strength. That is where I believe human destiny ultimately is taking us. I just hope we have time.

If everybody on the planet today had the same standard of living as the average European or American, we would need three new planets. But we don't even have one new planet. We have this one, and with the way we're polluting it, the shrinking water resources, the climate change, the experimentation with plants... the outlook is grim.

Surely it should be a matter of moral responsibility that we humans, different from other animals mainly by virtue of our more highly developed intellect and, with it, our greater capacity for understanding and compassion, ensure that medical progress slowly detaches its roots from the manure of non-human animal suffering and despair.

It's been proven by quite a few studies that plants are good for our psychological development. If you green an area, the rate of crime goes down. Torture victims begin to recover when they spend time outside in a garden with flowers. So we need them, in some deep psychological sense, which I don't suppose anybody really understands yet.

I believe that the tragedy [like terror attack] that's caused so much grief and suffering to so many thousands and thousands of people has also served as a call to action, because many people now are re-examining their own value systems, and the churches, temples, mosques and cathedrals are packed to overflowing for the first time in years.

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.

Without the heart to ground it and open it to who we really can be as human beings, the brain is a very dangerous machine. A machine that is saying: we've got to have economic growth; we've got to have unending economic growth, otherwise societies will collapse. And yet there should be something saying: wait a minute, this isn't going to work.

Language allows us to talk about the past and plan the future. We can teach children about things that are not present. And above all, we can bring people with different backgrounds and different knowledge together to discuss our problems. This actually gives me hope. I still think we are smart enough to not destroy planet Earth, our only home.

I started as - well, I wanted to be Poet Laureate. And I wanted to be a naturalist. That's how I began. I didn't have any desire to go and be a scientist. Louis Leakey channeled me there. I'm delighted he did. I love science. I love analyzing and making sense of all these observations. So, it was the perfect rounding off of who I was into who I am.

It is these undeniable qualities of human love and compassion and self-sacrifice that give me hope for the future. We are, indeed, often cruel and evil. Nobody can deny this. We gang up on each one another, we torture each other, with words as well as deeds, we fight, we kill. But we are also capable of the most noble, generous, and heroic behavior.

The more we learn of the true nature of non-human animals, especially those with complex brains and corresponding complex social behavior, the more ethical concerns are raised regarding their use in the service of man - whether this be in entertainment, as "pets," for food, in research laboratories, or any of the other uses to which we subject them.

We, as humans, have actually developed a sense of social responsibility. We have gone beyond our basic instincts. We can and we do. This is what sets us apart from the chimps. They are extremely brutal and hostile. Your next door neighbor is to be killed unless she is a juicy young female, who hasn't yet had her first baby, in which case you want her.

Chimpanzees are incredibly intelligent. They can learn more than 400 signs of American Sign Language. They have memories for spatial distribution, like numbers on a TV screen, way better than ours. You come onto the emotions: happiness, sadness, fear, and despair - all the things for which I was accused of being anthropomorphic when I ascribed them to chimpanzees.

Even in chimps there is true altruistic behaviour; behaviour that doesn't fit into the sociobiological model that says you either help a close relative and thereby your own genes, or you help somebody else now in return for their help in the future. When a very high-ranking male chimpanzee rescues a little orphan, saving his life, that kind of explanation doesn't work.

When you meet these outstanding leaders who have been through a programme that empowers them to take positive action, to make things better for people, for animals and for the environment - when you watch them interact and they start brainstorming, you realise you can relax, because they have got it right. They understand that there's more to this life than just money.

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.

Words can enhance experience, but they can also take so much away. We see an insect and at once we abstract certain characteristics and classify it - a fly. And in that very cognitive exercise, part of the wonder is gone. Once we have labeled the things around us we do not bother to look at them so carefully. Words are part of our rational selves, and to abandon them for a while is to give freer reign to our intuitive selves.

We started off with physical evolution and got our form. Then we somehow developed language, which meant cultural evolution could race so we could change our behavior really quickly instead of over hundreds and hundreds of years. And then comes moral evolution, which means we're not frightfully far along with people. And maybe we end up with a spiritual evolution, which is this connectedness with the rest of the life forms on the planet.

Researchers find it very necessary to keep blinkers on. They don't want to admit that the animals they are working with have feelings. They don't want to admit that they might have minds and personalities because that would make it quite difficult for them to do what they do; so we find that within the lab communities there is a very strong resistance among the researchers to admitting that animals have minds, personalities and feelings.

Louis [Leakey] was anxious to initiate a scientific study of these chimpanzees. It would be difficult, he emphasized, for nothing was known; there were no guidelines for such a field study; and the habitat was remote and rugged. Dangerous wild animals would be living there, and chimpanzees themselves were considered at least four times stronger than humans. I remember wondering what kind of scientist he would find for such a herculean task.

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