“Can anyone find something that grackles will dive into and kill themselves?”
Or pigeons? I hate pigeons!
In the finer dining establishments, pigeons are marketed as “Squab”, if you’re interested in taking culinary revenge.
There are a lot of pigeons in downtown Austin, but the grackles outnumber them by a bunch. We see clouds of them and you can't see either end.
Or pigeons? I hate pigeons!
A supermarket close to me plays recordings of hawks to scare off the birds. It works. Before, their parking lot was like a Hitchcock movie.