Description of App
The Audubon Bird Guide, North America, is a free app, developed with the support of the National Audubon Society. It provides information about 821 birds. Content includes pictures, sound recordings, and textual descriptions. The app allows the user to search by a bird's common or scientific name. You can also search for an unknown bird by specifying a series of attributes such as size, habitat, geographic location, month of the year, color, shape, and song pattern.
I have used other good bird apps including iBird Pro. The Audubon Bird Guide has largely the same functionality. It has one major additional feature; it links to eBird. eBird is a national online registry where birders nationwide contribute sightings. From the app, you can submit sightings yourself (if you register with eBird), and you can see the list of sightings of your favorite bird species, or the recent sightings in your geographical area.
This is a well-designed app with a vast amount of information for both the beginning and advanced birder, including many high-quality audio recordings of bird songs and calls.