This book contains probably all the information worldwide about magpies that was available to the author when the book was published in 1991. It is comprehensive and exhaustive. Birkhead is a good writer and it's possible to enjoy the book just by reading the text. However, half the book consists of graphs and tables that supplement the text. In essence, the book is a long scientific paper about every aspect of magpie ecology, but it can be read, enjoyed and appreciated by an interested layperson as well. Much of the book presents information and data from a long and diverse study of magpies that Birkhead and his students conducted in the Rivelin valley west of Sheffield, England, but Birkhead always compares the findings his group collected with those from other locations around the Northern Hemisphere inhabited by magpies. Among the real pleasures of the book are the superb illustrations of magpies by David Quinn. I've given the book five stars because I'm fascinated by the magpies in my northern Colorado neighborhood, I'm a biologist by training, and because of the quality of the research and the writing; readers less captivated by the birds may find the information a bit too detailed and repetitive.