Though animal rights activists and conservation biologists share a deep concern for the natural world, they are often at odds on issues of means and ends: whether saving a species justifies the culling of individual animals; whether zoos, increasingly active in conservation, are at the core captors or protectors of conservation, for example. This book presents a passionate, multi-vocal discussion - among zoo professionals, activists, conservation biologists, and philosophers - about the future of zoos and aquariums, the treatment of animals in captivity, and the question of whether the individual, species, or ecosystem is the most important focus for conservation efforts.