This book is amazing! I think I was expecting lots of nice photos and a few cool facts, but it's so much more than that. It’s by an ornithologist who specializes in bird coloration and who had already written an extensive two-volume work on the subject. Then he wrote this version for non-experts. One of the best bird books I’ve read - it answered so many questions, including ones I never even thought to ask.
The book draws on a huge variety of studies on bird coloration. Many of these are completely noninvasive, but others harmed the birds in pursuit of information. I'm not criticizing the book at all for including these, and if anything it made me more aware of how many books don't explain *how* scientists learned what they have about animals. But some readers might want a warning.
Otherwise, I highly recommend this book to all nature and bird nerds - it's fascinating!