Bird identification guides are available from the Audubon Society, Cornell University and National Geographic. Depending on the organization, options include online guides, special apps for iPads and mobile phones and printed copies. Amazon also offers guides in printed and Kindle editions.
The Audubon Society Guide to North American Birds website is interactive, featuring descriptions of different birds along with recordings of their vocalizations. The user clicks on a bird icon, and it opens a page with bird information and a listing of calls activated by more clicks. Users may also just click on the speaker in the top left corner of each bird picture in the main menu to get the basic call.
Cornell University's website is "All About Birds." As of 2015, the site has 596 different species in the online guide. A bird guide is available to find a specific species. A picture list also shows the most popular birds. When a bird is selected, it leads to identification information, history and a sound and video file for the bird. Complete online guides are available for purchase and download.
National Geographic has its online Backyard Bird Identifier. Users may find a species online, purchase printed guide books or download an app for iPhones and iPads.