What this book doesn't give you: A lot of teaching. It does list the basic folds, but other than that you're pretty much on your own. Beautiful photographs of the models. Not even on the cover. You have to make your own before you know what they'll really look like.
What this book does give you: 15 designs for origami birds with increasing levels of difficulty. These birds are (in order) a duck, a swan, a goose, a flamingo, a pelican, a heron, a pheasant, a seagull, a hummingbird, a cardinal, a cormorant, a stork, an eagle, a canary and a parrot. All designs fit in the 'intermediate' category, although the duck is much simpler than the others and the parrot is definitely high intermediate. The book has clear diagramming with occasional explanatory phrases. The designs are well-thought-out and the models look good when folded.
I have recently started doing origami and thought it would be good to learn how to make birds. However this book has designs in it that are currently too hard for me to make which is a little frustrating. I can however make some of the designs and they are very nice and do actually look like the things they are supposed to look like which is always good. Only buy this book if you are fairly competent with paper folding otherwise, like me you will be stuck on page 4.