In my opinion, the squirrle calls that I have used are mainly to calm the rascal's down after they get all wound up when I miss one. That is the only time they have really worked for me while bowhunting for them. When out with other tools of the squirrle hunting trade, I have found that when you are a bit further away, if you tap on the bulb or shake the bulb a bit, while the intended quarry is not in a good position, it will sometimes get them curious enough to sit still long enough to get a shot at them or make them turn just enough to be able to get a shot at one. Again this is just my opinion when it comes to these calls. I will say that if you knock 2 50cent pieces together properly, it sounds alot like a squirrle cutting on a acorn. Dad taught me that one a long long time ago,lol.