First, the paperback is 162 pages, not the 208 claimed . . . it is thin in physical size and thin in content. The illustrations are poorly done, the simplest computer-style graphics--no "real" art. Color photographs are small, ganged together, and clustered in a set of pages far from the references to them. The photographs seem to have been selected from what was available more than how best they illustrate the concept or feature.
Admittedly, at 162 pages, it cannot compare to the primary ornithology texts in the field, but at the price of this small paperback, you would be better advised to purchase the 382 page "Cambridge Encyclopedia of Ornithology (A Cambridge Reference Book)" ($15) and the 352 page Manual of Ornithology: Avian Structure and Function ($30) for the same combined price of this small paperback --more than 700 pages of authoritative information, fine art and photographs for the same price as "Essential Ornithology" which has the content and structure of a $20 paperback at best . . . selling for $45.