If you have a good mouser,,,,it is a valuable tool .
They keep all kinds of varmints cleared out ,,,,we have mice in our facility,,,,,and more birds than you can shake a stick at .
A good cat inside would definitely help,,,,and just the presence of a cat near where birds are will deter them from swooping down inside.
We thought it was funny the Safety lady asked for volunteers to catch Boozey. Catch? He walked right up to you like any house cat would. We still see raccoons and the occasional possum.