There are three kinds of books that count as animal (usually bird) guides.
1) A pocket field guide of the critters of a reasonably circumscribed geographical area, like the Peterson Field Guide to Birds of Eastern and Central North America. This is a small book that can fit in a big pocket, and a classic guide like this one is something you'll want to have with you while bird watching in the eastern or central US.
2) A big book, not suitable for pockets, of the critters of a reasonably circumscribed geographical area. A great example of this is The Crossley ID Guide: Eastern Birds . It…
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