National Geographic field guide to the birds of North America - Jon L. Dunn

The most comprehensive, up-to-date and authoritative field guide on themarket, the 6th edition is a birder's perfect companion. It features 300 new illustrations, new identification pointer labels on all art, subspecies listings, up-to-date taxonomic organization, and many elements you won't find in any other guide, including 26 new species, new migration overlays on range maps, anda new section of subspecies maps. Plus, in addition to the unique and handy thumbtabs that make for easy navigation, we've added a full-color visual index to aid in quick identification. These are just a few highlights of this critically-acclaimed guide that Bird Watcher's Digest called "...an awesome work...the most up-to-date field guide out there."