There are several characteristics that make up a field guide. It should be "pocket size" (and birders have huge pockets, so this may not be as much of a restriction as it sounds). It should cover the geographical region in which you are watching the birds, although in some remote areas of the world you may not have this luxury. During my years working in Zaire, we had only a Southern African bird guide, and made due. And the book should be of the right kind and level for your needs.
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