New enthusiasts are flocking in record numbers to the fascinating pastime of birding. National Geographic has been meeting their need for clear and accurate information for 25 years with our million-selling Field Guide to the Birds of North America. Now, to better serve the expanding market, we've customized our field-guide format to offer unique coverage for birders east or west of the Rocky Mountains. These new volumes deliver in-depth information on every bird officially recorded in the specified area, with illustrated accounts of the different plumages and life stages, along with...