Four of us were lucky to spend 45 minutes on an October morning with a Northern saw-whet owl along the high Cascade crest. Conifer trees behind it made a muted blue background. Soon after its photo was taken, the owl swooped down with frost flying off its head - like it was flying in stars...
Found on flickr
I dont know if this is what they have, but BirdNET-Pi is the first thing that comes to mind.
Classify birds acoustically with BirdNET-Pi
Cornell also has it in app form if you want to play with it on a phone/tablet.
I haven't tried it at all, so I'm curious how well it works as well!
WOW!! I had no idea this existed, I'm seriously impressed!
I have been looking At Raspberry Pi for a while, but it would be a bit of a slog for me to get my head round it all....BUT, one day I'm going to find an idiots guide and dip my toe in the water