Those are European Starlings and are designated as pests by the Fish and Wildlife Service and Uncle Sam would appreciate it you exterminate them with extreme prejudice as they are non native and desecrate the habitat for your Robins and other indigenous song birds.
Thanks, I’m just not that concerned about it really. If it had been squirrels or crows, then I’d have just “walk[ed] on by” as Dionne sang. :0)