This book is incredible. The first few chapters discusses general bird anatomy, behavior, etc. (which were fascinating). The book then goes into details on North American bird groups (Hawks, Kingfishers, Grebes, Wood-Warblers, etc.) and in each chapter includes most of the following sub-chapters for each bird group: Taxonomy, Variation, Plumage, Vocalizations, Habitats, Food and Foraging, Flight, Breeding, Movements, Conservation, and Accidental Species.
Took me a while to get through the book because it was so long and had a TON of information but I enjoyed every page and would highly recommend for anyone interested in learning about North American birds.