The full-page, color photos are incomparable and include insets of winter plumage, color morphs and more. Plus, with the easy-to-use format, you don't need to know a bird's name or classification in order to easily find it in the book. You'll also start recognizing birds by sound when you listen to the two audio CDs, featuring the highest quality digital recordings and approximately 120 minutes of bird calls. This set is a must-have, and it makes a perfect gift!