After the hawk took my husbands favorite chook we tried the technique of hanging discs from ropes strung in different places through out the yard. Our yard looks kind of strange with all the discs twirling and dangling from the ropes (BUT KNOCK ON WOOD) we haven't had another attack since they went up . Since they are in the backyard it is hard to see them from the front of the house so the neighbors haven't said anything to us. We think (hope) we may have won this last round of chicken extermination from the sky battle.