I like this project not only for the recognition and photographing of stray cats (or maybe to identify neighbours’ cats straying into your yard), but the bird “scaring” part is nice and safe to use if you have a problem with birds sitting on your window sill and setting off your alarm beams.
The project can probably be adapted for other purposes too.
See https://www.xda-developers.com/raspberry-pi-project-identify-stray-cats/