This book is one of my favorite birding books. I am reticent to call it a field guide because it is so much more than that. Incredible amounts of information on all the sparrows. Great range maps AND descriptions of migration and vagrancy (can I hope to see this bird in my area?), and all the other natural history and behavior information you'd expect. Beautiful plates showing ALL the different plumages, primary and basic, male, female and juvenal. And it's not just a wealth of information, it's a beautiful book, well written and a delight to own.