Matthieu Ricard book here a plea for animals. Cartesian and former scientist, he presents the facts pragmatically, this book synthesizes and refers to matters affecting the animal condition and have given rise to many works. Altruistic and Buddhist monk, he urges us (without us feel guilty) to worry about the fate of the animals, to understand our similarities (suffering, intelligence, compassion ...) without ever denying the specificity of the human species. No moral lesson, then, just common sense, logic and obvious arguments if one takes the trouble to question our way of life and thought. For everyone to have their opinion but also to everyone open their eyes to the reality of the death of billions of animals annually for our own satisfaction. Our ability to compassion and to step back we did not she also confers responsibility?