>> deterrent to pigeons
I feel that way about squirrels and Blue Jays, but my war with squirrels goes back decades. Rats with furry tails!
I'm even squeamish about shooting a slingshot at them (not that I've ever been able to hit one).
The father of a friend of a friend used to keep a .22 rifle by the upstairs bathroom window so he could at least scare the squirrels away from the bird feeders while sitting on the pot.