No one will be surprised to know that dogs fart, and also cats. Horses fart a lot, and cows even more. But what about chimpanzees? And the cheetahs? What about snakes, dinosaurs, and spiders? In this delightful book about one of the most natural and gross functions of the human body, two scientists tell us not only what animals fart (hint: unicorns don't) but why: what they feed on, how their digestive systems work, in what its secret fart codes consist of and how we humans can study this fascinating area of biology. It is not always easy ...