“...In little more than a single century from 1820 to 19450, no less than fifty-nine million human animals were killed in inter-group clashes of one sort or another.... We describe these killings as men behaving "like animals," but if we could find a wild animal that showed signs of acting this way, it would be more precise to describe it as behaving like men.”

“...of eighteen kittens reared in the company of rodents, only three became rodent-killers later on. The other fifteen could not be trained to kill later by seeing other cats killing. For them the rodents had become 'family' and were no longer 'prey'. Even the three killers would not attack rodents of the same species as the one with which they were reared.”

“Biologically speaking, if something bites you, it is more likely to be female.”

“We never stop investigating. We are never satisfied that we know enough to get by. Every question we answer leads on to another question. This has become the greatest survival trick of our species.”

“We talk of humans behaving indistinguishably from animals; this view is an insult to animals, as they would not treat other creatures of their own kind the way we at times behave towards each other.”

“Animals don't behave like men,' he said. 'If they have to fight, they fight; and if they have to kill they kill. But they don't sit down and set their wits to work to devise ways of spoiling other creatures' lives and hurting them. They have dignity and animality.”

“My writing, on the other hand, is always done with my readers in mind. I never write for my own amusement. I always try to put across an idea that I feel is important, in the most easily readable form I can manage. This has annoyed some of my academic colleagues, who feel that I am oversimplifying my subject, but I argue that at least my writings are widely read, while theirs stay firmly within the confines of their academic ivory towers. And I always work with one special rule in mind: simplification without distortion. This is, in fact, much harder than the usual self-indulgent academic writing.”