Those expecting a Sibley's style field guide with pictures, maps, and bird descriptions all conveniently located on the same page will be disappointed with this guide. Having to go back and forth between picture plates, located in the middle of the volume, and text descriptions at the front or rear of the volume was Herculean pain in the you know what. I got so frustrated with lugging this heavy tomb around the mountains and jungles of Peru that I began to leave it in my lodge and rely more on guides, who also carried the book, for identification. It was easier to focus on the birds for as long as possible and then argue with the guides later over lunch about what we saw.
With that being said, this is the only comprehensive field guide for Peru's 1,800+ species of birds. With it, I saw about 188 different species on 12-day, October 2005 trip to that country. The artwork in the book is generally excellent, and while the descriptions tend to be a bit sparse compared to Sibley's Field Guide to Birds of Eastern North America, they contain all the key identification features. In defense of Clements and Shany, they had to design a guide for 1,800+ birds whereas Sibley's Eastern North America pocket field guide only covers 650 species. Trying to compare the two, in short, is like comparing apples to oranges. Clements and Shany had to somehow create a guide to one of the ecologically diverse countries in the planet and still keep the production costs low enough for Amazon to offer it for just $60.00 (hint: buy it at Amazon or pay much more for it in Peru if you can even find it). Compromises had to be made, but this is still the only birding book to buy for Peru. All others only focus on small regions of the country such as the Machu Picchu area and are not useful for birders hitting multiple venues. Furthermore, the art in the Clements and Shany guide is much, much better than the art found in the regional publications.