A friend showed this to me a few months ago. You take a Raspberry PI, hook up a microphone,
install some software on it, and you have a bird sound recognition device.
It's called BirdNET-PI and it is pretty cool. If you've tried the Merlin Bird ID app from Cornell University,
it's pretty much the same thing. It documents it all and analyzes all the sounds. Pretty cool if you ask me.
Here's a little bit about BirdNET-PI
https://cnyweather.com/BirdNET.phpThis is real time recognition of the birds in my back yard.
http://birdnet.cnyweather.com