I used one for the 1st time last Nov. and I "imitated" to the best of my abilities, the sound that was shown on the DVD and had a 1 1/2 year old 8 come within 40 yards of me, now I can't say one way or the other if he just showed up or came because of that call, becauseof the direction he came in from, I coudn't see him until he was right on top of me, so I didn't get to watch how he responded while actually calling, if that makes any sense.