To identify a bird sound, there are several apps and websites available that use artificial intelligence and machine learning to recognize bird songs. Some of these include:

• Merlin Bird ID: This app by the Cornell Lab of Ornithology can identify bird sounds and recognize the sounds of over 870 species in the U.S., Canada, Western Palearctic (Europe), and Neotropics.

• BirdNET: This app by the K. Lisa Yang Center for Conservation Bioacoustics at the Cornell Lab of Ornithology and Chemnitz University of Technology uses artificial intelligence and neural networks to identify over 3,000 of the most common bird species worldwide.

• Smithsonian Migratory Bird Center: This website offers a bird song identification guide that allows users to select sound attributes and species to narrow down the possible bird sounds.

To use these apps and websites, simply record the bird sound using your smartphones microphone and upload it to the app or website. The app or website will then compare the sound to its database of bird songs and provide a list of possible bird species that match the sound.