Having always found raptors difficult and confusing, I found this book a revelation. They are still difficult and confusing but now I understand why, and can better make sense of what I am seeing in the field. Pages and pages of text, diagrams and photos describe and illustrate each species, with identification summaries in flight at a distance, in flight closer-up and perched, together with sex and age differences. There is also a very useful section on understanding moult patterns and how this helps in aging a bird. The book is a bit heavy to carry in the field, but certainly one to refer to at the end of the day or before going out to look for a particular species. Excellent.