This book (previously published as Consider the Birds) is a introduction to the biology of birds.
Birds are some of the most remarkable of living things and the things that make then remarkable, migration, flight, egg laying, courtship are all included here. What I found to be missing, or at least less obvious, was a sense of wonder at how remarkable birds actually are. In some ways I think the book falls between two stools - it is neither really comprehensive enough to act as a text book, nor entertaining enough to be taken as a populist science work. The book covers most of the major aspects of birds lives in a manner that is more lucid than entertaining. While the intention of the book is clearly serious, it is not without its lighter passages, but I did not find these as frequent as some of the cover comments would suggest.
Almost 25% of the book is taken up with a "cast list" of birds, listed by Family. While such a section is needed in a book aiming at being comprehensive it seemed rather long, and certainly in the wrong place in the book. It reads like a appendix that has somehow been dropped into the middle of the book The feeling that this section is not really the main game of the book is reinforced by the fact that the phrase "and we will look at this interesting aspect of these birds at a later date" (or one that means the same thing) is very common here. An understanding of bird taxonomy is important, but if the focus of the book is "who birds are and what they do" do we need almost a quarter of the book to be used looking at taxonomy, which is, after all, just a human invention and probably wrong in many of the relationships it currently proposes? I would suggest that you read the sections about the types of birds in which you are especially interested and then move on.
There are other aspects of this book which I did not really enjoy,and some that seem to less than acurate. One being the suggestion that Archaeopteryx (probably the most famous of bird fossils) is the direct ancestor of modern birds. Fossilization is uncommon, and locating fossils unlikely, so for any single individual bird to be fossilized, found and be the direct ancestor seems unlikely. The more fossils we find the more "bushy" family trees become, with most branches ending in extinction. Does Archaeopteryx give us a window into bird evolution? Yes. Is it the direct ancestor of the birds on our lawns? Probably not.
If you are new to the biology of birds this book is an excellent starting point. However, if you already have more than a passing understanding of birds and their biology, this may not be the book for you.