This book is an excellent adjunct for any birder interested in hawk identification. I enjoyed the format which does not provide only pictures for the process of identification. The book makes an effort to educate the reader by understanding the probability of the bird type based on dates, recognizing flight patterns in addition to bird shape to improve identification. I am amazed at the distances I can identify a raptor when you use the knowledge gained by this resource. This is not a book that will teach you everything and again you will not be able to use this book alone as it does not replace a field guide.