I have used them in the past and seen NOTHING how ever I just bought a video callled tactics for talking to deer from Peter Fiduccia and he shows several differant ways to use the bleat can and low and behold the way I have been using it as well as many I am sure I was making a distress call according to this video, basically when you flip it if you let it sound long and slow you are making a distress call cut that amount in half and you now are making a social call verses an alarm or distress call, I plan to use this soon I'll keep you posted as to the results. if you are interested here is the link and No I do not work for these people but considering how many instructional videos I have bought I should own a vast majority of there stock LOL, but if you are a newbi with no one to teach you as I am you will find these videos very helpfull. Good Luck

http://www.stoneywolf.com/catalog/product_info.php?cPath=29_42&products_id=405