By Roger Tory Peterson and Virginia Marie Peterson
"In celebration of the centennial of Roger Tory Peterson's birth comes a historic collaboration among renowned birding experts and artists to preserve and enhance the Peterson legacy. This new book combines the Peterson Field Guide to Eastern Birds and the Peterson Field Guide to Western Birds in one volume, filled with accessible, concise information and including almost three hours of video podcasts to make bird watching even easier."
The Smithsonian Handbooks series of field guides includes excellent illustrations, with notations that show you what to look for when trying to determine what species you're observing. Watch out for big white whales, however!