Last spring Sand Hill Cranes descended upon my corn fields. They devastated 25 acres of one 40 acre field of corn that was about three inches high. I counted over 200 Cranes in the one field. I took my shotgun and fired up in the air. They flew to the other end of the field and went back to pulling up the corn plants. I went to the Department of Ag to see what I could do about them. They referred me to the Michigan DNR. I went to them to see if I could shoot them, they referred me back to the Dept. of Ag, saying that it was a migratory bird, and is protected. After half a dozen calls, one person at the Dept. of Ag said they have little devices that shoot a shotgun shell primer off from a timer. He asked how large my lawn was. I told him I have over a thousand acres of corn that was being threatend. He hung up. This year I'm using the 3 S system with my .223.