"Louis deliberately chose someone who hadn’t been to university because theories of animal behaviour at that time were very rigid, and Louis didn’t want someone whose mind was biased in that way. Wise man. But still I had the responsibility to prove myself. I remember looking up at the hills and wondering, “Can I do it?"

“Thousands of people who say they "love" animals sit down once or twice a day to enjoy the flesh of creatures who have been utterly deprived of everything that could make their lives worth living and who endured the awful suffering and the terror of the abattoirs— and the journey to get there— before finally leaving their miserable world, only too often after a painful death.”

“Well, in some ways we’re not successful at all. We’re destroying our home. That’s not a bit successful. 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.”

“But if the same tests, the same foods are examined by an independent scientist, then it turns out that in almost every case there are quite serious harms done to the rats, the mice or the other poor unfortunate animals, particularly internal organs like liver and kidneys and things of that sort.”

“Anyone who tries to improve the lives of animals invariably comes in for criticism from those who believe such efforts are misplaced in a world of suffering humanity.”

“As I traveled, talking about these issues, I met so many young people who had lost hope. Some were depressed; some were apathetic; some were angry and violent. And when I talked to them, they all more or less felt this way because we had compromised their future and the world of tomorrow was not going to sustain their great-grandchildren.”

“The long hours spent with them in the forest have enriched my life beyond measure. What I have learned from them has shaped my understanding of human behavior, of our place in nature.”