Based on the American Museum of Natural History's archives, this book provides a picture of each of the 58 species whose skeletons are exhibited in the museum's Great Hall of Dinosaurs. It also recounts the history of each fossil's discovery, excavation and acquisition by the museum. Among the topics covered are each dinosaur's features, distribution, size and diet, and the book offers insights into how their evolutionary history has unravelled over the past 150 years. An account is included of the bird-like dinosaur fossil recently discovered in Mongolia by one of the book's co-authors, Mark Norell.