This comprehensive guide is renowned for its detailed illustrations and descriptions, and is considered an essential reference for birdwatchers and ornithologists.
He has also authored other books on birds, including:
* "The Sibley Guide to Trees"
* "Birding Basics"
* "Sibley's Birding Basics for Kids"
If you're looking for a specific book, you'll need to provide more information, such as the title or a brief description.