BirdNerd: Bird Song Identifier is an Android app that uses a neural network to identify birds by their voice. The app is free to use and falls under the category of Education & Reference. It can identify multiple individual bird species even in a chorus with noise-proof recognition for nature and cities. The app identifies birds by their songs, calls, and other specific sounds like chick signals.

The neural network used in the app is trained on sound records, and it seeks hidden patterns in bird signals to identify the species. The more data the app receives, the better the answers it provides. The neural network works on a server, so Internet access is necessary to use the app. Currently, the app is available only in Europe, but Siberian and North American species are being added.