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The purpose of keeping any collection of wild animals in confinement should be threefold; first, to conduct as complete as possible a biological study of every species, especially those aspects which are too difficult or too costly to study in the wild and which may help in the preservation of that species in its natural habitat; second, to aid severely endangered species by setting up, under ideal conditions, protected breeding groups and, eventually, a reintroduction programme, so helping to ensure their future survival; thirdly, by the display and explanation of this work to the public, to persuade people of the vital necessity and urgency for the overall conservation of nature.

You are not necessarily depriving him of his liberty, for territory is a form of natural cage and the word "liberty" does not have the same connotation for an animal as it does for a chest-beating liberal homo sapiens, who can afford the luxury of abstract ideas. What you are, in fact, doing is much more important, you are taking away his territory, so you must take great care to provide him with an adequate substitute, or you will get a bored, sick or dead animal on your hands.

The thing that turns a cage into a territory may be something quite slight, but it need not be size. It might be the shape of the cage, the number of branches or the lack of them, the absence or presence of a pond, a patch of sand, a chunk of log, which could make all the difference. Such a detail, trivial to the uninformed visitor, can help the animal consider this area his territory, rather than simply a place where he ekes out his existence. As I say it is not necessarily size which is of prime importance. This is where people who criticise zoos go wrong, for they generally have little idea what circumscribed lives most animals lead.

There would be a dreadful outcry if anyone suggested obliterating, say, the Tower of London, and quite rightly so; yet a unique and wonderful species of animal which has taken hundreds of thousands of years to develop to the stage we see today, can be snuffed out like a candle without more than a handful of people raising a finger or a voice in protest. So, until we consider animal life to be worthy of the consideration and reverence we bestow upon old books and pictures and historic monuments, there will always be the animal refugee living a precarious life on the edge of extermination, dependent for existence on the charity of a few human beings.

Firstly what does conservation mean? It is not merely the saving from extinction of such species as the Notornis, the Leadbetters Possum or the Leathery Turtle; this is important work but it is only part of the problem. You cannot begin to preserve any species of animal unless you preserve the habitat in which it dwells. Disturb or destroy that habitat and you will exterminate the species as surely as if you had shot it. So conservation means that you have to preserve forest and grassland, river and lake, even the sea itself. This is not only vital for the preservation of animal life generally, but for the future existence of man himself — a point that seems to escape many people.

We have inherited an incredibly beautiful and complex garden, but the trouble is that we have been appallingly bad gardeners. We have not bothered to acquaint ourselves with the simplest principles of gardening. By neglecting our garden, we are storing up for ourselves, in the not very distant future, a world catastrophe as bad as any atomic war, and we are doing it with all the bland complacency of an idiot child chopping up a Rembrandt with a pair of scissors. We go on, year after year, all over the world, creating dust bowls and erosion, cutting down forests and overgrazing our grasslands, polluting one of our most vital commodities — water — with industrial filth and all the time we are breeding with the ferocity of the Brown Rat, and wondering why there is not enough food to go round. We now stand so aloof from nature that we think we are God. This has always been a dangerous supposition.

The attitude of the average person to the world they live in is completely selfish. When I take people round to see my animals, one of the first questions they ask (unless the animal is cute and appealing) is, "what use is it?" by which they mean, "what use is it to them?" To this one can reply "What use is the Acropolis?" Does a creature have to be of direct material use to mankind in order to exist? By and large, by asking the question "what use is it?" you are asking the animal to justify its existence without having justified your own.

I said I liked being half-educated; you were so much more surprised at everything when you were ignorant.

History is that certainty produced at the point where the imperfections of memory meet the inadequacies of documentation.

Enforced solitude, as in solitary confinement, is a terrible and disorienting punishment, but freely chosen solitude is an immense blessing. To be out of the rattle and clang of quotidian life, to be away from the garbage of other people's amusements and the overflow of their unwanted subjectivities, is the essential escape. Solitude is, beyond question, one of the worlds great gifts and an indispensable aid to creativity, no matter what level that creation may be hatched at.

The word "death" is not pronounced in New York, in Paris, in London, because it burns the lips. The Mexican, in contrast, is familiar with death, jokes about it, caresses it, sleeps with it, celebrates it; it is one of his favorite toys and his most steadfast love. True, there is perhaps as much fear in his attitude as in that of others, but at least death is not hidden away; he looks at it it face to face, with impatience, disdain or irony.

Modern man likes to pretend that his thinking is wide-awake. But this wide-awake thinking has led us into the mazes of a nightmare in which the torture chambers are endlessly repeated in the mirrors of reason.

So fishing contributed to an important lesson of my life -how to be alone. I still think solitude is one of the world's great gifts. "Se sei solo," wrote Leonardo da Vinci, "sarai tutto tuo"