A caged animal in the heart of the city, thousands of miles from its natural habitat, neurotically pacing in its confinement . . . Zoos offer a convenient way to indulge a cultural appetite for novelty and diversion, and to teach us, albeit superficially, about animals. Yet what, conversely, do they tell us about the people who create, maintain, and patronize them, and about animal captivity in general? Rather than foster an appreciation for the lives...