I have a UniFi doorbell that I chose because it's self hosted and the video stays in my home. It also easily lets you get an RTSP stream of the camera feed.

Earlier this spring we put a bird feeder outside the front door and it dawned on me I could be piping the doorbell cam into BirdNET to classify the bird calls. With an RTSP stream there's no need to mount a microphone anywhere, that comes for free from the doorbell.

My wife is the bird person in the house more so than I am, but it was still really fun to set up and watch the identifications come across.