Hey North Texan,
If you're worried I can sell you a Snake Whistle. I've got the patent on it so if anyone else tries to sell you one its a fake. If you blow the snake whistle it runs snakes off. So you can varmint call in safety. Not to worry it is inaudible to other game so no worries about blowing your set up. Here's a Pic of my snake whistles:
They retail for $9.99 plus $5 shipping and handling. How many do you want?