If they haven't been called or hunted around your area, you may be able to wack a few before they smarten up. If you make a set, remember that they will try to circle downwind as they come in to a call and you can't twitch because they are on alert to any movement. That's why it's good to have a decoy out in front of you, especially one that has movement, to get their attention focused on that. A good trapper is really the best way to go to really take a good number out of an area, but you'll never get rid of all of them because they're just like cockroaches and Cher---they've been around forever, LOL!