In this book, Keekok Lee asks the question, "what is an animal, and how does our treatment of it within captivity affect its status as a being?" This ontological treatment marks the first such approach in looking at animals in captivity. Engaging with the moral questions of zoo-keeping (is it morally justified to keep a wild animal in captivity?) as well as the ontological (what is it that we conserve in zoos after all? A wild animal or its shadow?), Lee develops her own original hypothesis, centred around the concept of "immuration"--defining this in contrast to domestication--and thereby provides a unique addition to the growing body of work on animal ethics.