I think the best call here in West Texas is the sound of an electronic feeder going off. I have feeders set for 7 AM and 4 PM, it's like ringing a dinner bell when they go off. A couple of weeks ago I saw what I thought was a doe approaching the feeder just as it was going off, it was a light colored pig. As it made it's way toward the feeder I glanced away, when I looked up I had 40-50 pigs on the feeder, it only took a few minutes and the ground looked like it had been vaccumed.
The pigs have been so bad this year that we have been shooting them and just draging them off for the buzzards. (or for the other hogs to feed on.) So far this year I have killed seven, and my son has killed three. I got my deer early, so now I am out just to shoot pigs.