Any interest in over engineering it a bit more? We did something similar to spook rabbits[1] in a garden using a computer vision model to detect them (vs your masked motion sensor). Looks like lots of users have shared pigeon detection datasets[2] that could make a good starting point.

[1] https://blog.roboflow.com/rabbit-deterrence-system/

[2] https://universe.roboflow.com/search?q=Pigeon&t=subject