National Geographic Birding Essentials
Jonathan Alderfer is chief consultant for the National Geographic Birding Program and a widely published author and field guide illustrator. Most recently, he was co-author of theNational Geographic Field Guide to the Birds of North America,Fifth Edition (Fall 2006).Jon L. Dunn is an expert on the identification and distribution of North American birds. He has a long history with theNational Geographic Field Guide to the Birds of North America,having served as chief consultant on four previous editions and co-author on the fifth edition (Fall 2006).