Weaving history, literature, anecdotes, scientific studies, and Masson's own vivid experiences observing pigs, cows, sheep, goats, and chickens over the course of five years, this important book at last gives voice, meaning, and dignity to these gentle beasts that are bred to be milked, shorn, butchered, and eaten. Can we ever know what makes an animal happy? Many animal behaviorists say no. But Jeffrey Masson has a different view: An animal is happy if it can live according to its own nature. Farm animals suffer greatly in this regard. Chickens, for instance, like to perch in trees at night, to avoid predators and to nestle with friends. The obvious conclusion: They cannot be happy when confined twenty to a cage.