I'll also recommend another Android app, BirdNET [1]. This app does audio identification. and is jointly developed by a small team of EU researchers and Cornell. Covers 1,000+ species in North America and Europe. I've found that it does a remarkable job of identification even with crappy mobile phone microphones, and even in noisy environments. It ships off a recording to a server for analysis using neural nets trained on 2.5 million samples. I'm assuming that it's using Cornell's audio recordings, perhaps others. Times when I don't get a good match, it's best guess is often correct for birds that I know.

I've seen similar apps for iOS, but haven't tried any of them.

1. https://play.google.com/store/apps/details?id=de.tu_chemnitz...