Overall this book is phenomenol. There is more knowledge in it then the average person will ever need. The book has carefully considered photographs that are in themselves amazing. The author also does an excellent job of ensuring that common terms utilized for birds also found in Britain are correctly interchanged to North American common names where appropriate. I especially loved the information on the first bird (chapter 1).
What misses the mark for me are things that are small in significance but in themselves, add up to me not giving this book five stars. The first is that the author assumes that the reader knows human anatomy and physiology along with plane aerodynamics. If you do not, some areas of this book may be confusing at times. Furthermore, when the author lists names of birds with both their common and scientific names, the sentence(s) can become confusing to follow. The anatomy and physiology section, taking the bulk of the book should be split into more chapters. Again very minor details that could use some work.
If your a ornithology enthusiast looking for a well written thorough book that concentrates on adaptations, physiology and anatomy this book is for you.