How do you get rid of Galahs?

Ive tried so many things now its driving me mad! They are nibbling the ends of my Kikuku grass lawn and killing it off slowly. Started off with 2 now theres 10. Ive used an Owl statue that I move around, that lasted 3 days. Ive bought the Gliding Hawk strung up with fishing line, that lasted 4 days. Ive tried throwing a white bucket at them that works everytime but I cant be there every minute to do it. Theyre too cunning like a fox. I heard Jack Russel dogs are good for chasing away birds.