To modern sensibilities, nineteenth-century zoos often seem to be unnatural places where animals led miserable lives in cramped, wrought-iron cages. Today zoo animals, in at least the better zoos, wander in open spaces that resemble natural habitats and are enclosed, not by bars, but by moats, cliffs, and other landscape features. In Savages and Beasts, Nigel Rothfels traces the origins of the modern zoo to the efforts of the German animal...