Overtaken by Grackles!? These birds have come posterior this year in bigger and meaner...

These birds have come posterior this year in bigger and meaner numbers. I can't budge outside to take out trash or do patio work without human being dive-bombed by a whole group of them. They chase rotten all other birds and at hand isn't even a point to putting out birdseed or bird houses.
I know they are migratory (sp) so I can't shoot them. Do the same ones come wager on to the same spot every year?
How can I attain these birds off my property?
Answers:    hey in that, being an aussie enjoy never heard of a grackle, but we are advise to put out a bird scarer in the shape of a hawk or other predatory bird. they are available here from substantial garden suppliers so i imagine something similar would be available where on earth you live. you just put them up on a shed or outside on a giant fence or pole. they absolutely keep birds away! mind you , adjectives birds will stay away while it is up so you may want to take it down when your grackles hold gone! migratory birds do usually return to the same nouns each season, so you may own to repeat the exercise till they disappear totally. good luck.