These editions have the same easy-to-use qualities but with a great new feature. They are designed with the audio track number at the bottom of the page so the user can read about the bird and then go right to the track number to hear the sounds it makes. But, while designed as a companion to the audio CD, the book can be enjoyed, as always, on its own. Also included are new sharper images and additional photos of juveniles, morphs and more.