Charles Foster set out to know the ultimate other: the non-humans, the beasts. And to do that, he tried to be like them, choosing a badger, an otter, a fox, a deer, and a swift. He lived alongside badgers for weeks, eating earthworms and learning to sense the landscape by smell rather than sight. He tried to catch fish in his teeth while swimming like an otter, rooted through London garbage cans as an urban fox, was hunted by bloodhounds as a red deer, nearly dying in the snow. And he followed the swifts on their migration route over the Strait of Gibraltar, discovering himself to be strangely connected to the birds. A lyrical, joyful, and completely radical look at the life of animals—human and other— Being a Beast mingles neuroscience and psychology, nature writing and memoir to cross the boundaries separating the species.