The World Atlas of Birds: is an atlas that covers in brief many of the diverse group of birds according to their classification. With around 10,000 living species, the book goes through examples of each class of birds. Starting with general information about each class, followed by as many great images of birds under the different classes within the same context and arrangement of the literature above. Bird watching is the fastest growing recreational pursuit in the United States. Adding all wildlife watching equipment together, America as a nation spends on bird watching nearly 20 billion dollars!. The book comes in two parts trying to cast the light on what is once reported by US volunteers as being (the majority of wildlife observations). It is the world of birds.