Last fall, I got into a mess of pigs in a thick area of tall grass and briars. I mean I was covered up with them. The area was so thick that I couldn't see more than a few yards around me and one or two lanes that never seemed to have hogs in them. Occassionally, one of the hogs would get nervous or upset and start making this heavy breathing sound like it was trying to get my scent. I found that if I copied that sound they would calm down and go back to feeding.
Since then, I have used that trick about four or five times with great success. There, now I have gone and told you my secret.
Gregg