Audubon Bird Guide: North America. Unlike the average printed field guide, this app includes songs and calls — and more than 800 species of North American birds.

This app uses Bird ID to identify a bird based on your observations, providing a curated list of possible matches. Audubon also provides access to a library of more than 3,000 photos and eight ...

Also free, the Audubon Bird Guide app from the nonprofit conservation group uses visual input to identify birds and displays a tally of birds seen. Both apps allow the user to search according to ...