The Peterson Birds app, which regularly sells for $9.99, is currently available in the App Store for $0.99. This is a great deal on a great app. Having a bird app on your device is so much more convenient than schlepping a book, especially since you typically have your device with you. Plus, unlike books, birding apps also have recordings of their songs. You simply tap on the illustration to hear the song. The Peterson Birds app includes information from eight different Peterson Field Guide Books, such as the very popular Peterson Field Guide to North America, giving you details on over 800 species of North American birds. The app offers illustrations, range maps, bird songs, and nest photos, and claims to give you more detail than any other bird app. It also claims to be the only one that lets you compare similar species by sight, song, and range from one screen. The QuickFind index lets you go to information on a particular bird with a single tap—letting you avoid having to type in the bird's name.