What is the best / your favorite bird guide?

I am looking to buy a new bird guide. I need one small enough to carry me when I go birding, but large enough to contain a good amount of information on the habits of birds. I live in the U.S. east coast, if that helps. So what are your favorite bird guide? Which would you say is the best?

Some of my favorites are the National Audubon Society Field Guide to North American Birds, The Sibley Field Guide to Birds, and National Wildlife Federation Field Guide to Birds North America. These three books have all the information you'll ever need to help identify the species of North American birds. They have great photos, descriptions, maps, and checklists of birds. The National Audubon Society has a book that is just east of North American birds in it, if that's all that interested in David Allen Sibley is the author.

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