Merlin the bird app, previously:

Merlin Bird ID (637 points, 7 months ago, 215 comments) https://news.ycombinator.com/item?id=44176829

Behind the scenes of Sound ID in Merlin – Identify birds using your phone (2021) (235 points, 2 years ago, 51 comments) https://news.ycombinator.com/item?id=38550737

Identify Birds by Their Chirp (93 points, 2022, 27 comments) https://news.ycombinator.com/item?id=31785736