Stick a Pi in your backyard to detect birds

Agg over at OCAU (hello if you're still reading The Sizzle!) made a forum post over there about his experience setting up BirdNET - "you get a Raspberry Pi with a USB microphone, and stick it somewhere where it can hear the outside world. It listens for birdsong, then identifies the birds it hears and serves up a website with the recordings, stats and info on the birds. You can even listen live to the audio feed and watch a spectrogram of it if you like". I should really set this up on the side of my backyard shed. A nice little enclosure, battery and solar panel would let it live outside and not need to be near a power outlet.