Book excerpt: A trip to the zoo, when very young, is an important part of curriculum in America, but as we mature, we learn that zoos represent captivity, and often produce undesired, unhealthy results on the inhabitants. This volume asks students to think critically about Earth's animals, and how we treat them. Essays discuss zoos and the treatment of animals in captivity, covering the role of zoos in education and ensuring the survival of certain species, the problem of surplus animals, and how elephants react to captivity.