A field guide is a book or other resource that is used to help identify birds in the field. It typically includes illustrations or photographs of the birds, as well as information about their characteristics, habitat, and distribution. Field guides can be organized in a variety of ways, such as by location, by family, or by size and shape. They are an essential tool for birdwatchers and ornithologists, as they allow you to accurately identify the birds you see and learn more about them. Some field guides are specific to a particular region or habitat, while others cover a wider geographical area.