Predatory extermination of animals is a topic that worries many people on earth today. English conservationists Thornton and Carrie, often at the risk of their lives, conducted their own investigation into the illegal ivory trade and wrote a book about it. The second part of the volume, written by J. G. Davis, is devoted to the tragedy of the existence of one of the oldest inhabitants of Africa - the rhinoceros, mercilessly destroyed because of its supposedly magical horn.