DESC: This book is the ultimate resource for birding expeditions and backyard observations. Sturdy, portable, and easy to use, it remains the definitive guide and includes every known bird species on the continent. Revised forth edition has 250 updated range maps, new plumage and species classification information, specially commissioned full-color illustrations, and a superb new index that helps you quickly identify birds in the field. 280 plates with more than 800 full-color art pieces and 630 range maps.