National Geographic Field Guide to the Birds of North America:

From the The National Geographic Field Guide to the Birds of North America continues to be the most sought after, most authoritative, and most accessible field guide to birds on the market. The fourth edition of the Field Guide to the Birds of North America is a great guide for birders. Sturdy, portable, and easy-to-use, it features superlative information on bird species recorded in North America. This edition features range maps, plumage and species classification information, specially commissioned full-color illustrations, and a superb index that allows birders in the field to quickly identify a species.