Mb-187. I do not doubt you heard what you heard. It also sounds like you know the area quite well.Is it possible that somehunter without much knowledgewas blowing through one of these calls for 20 min and moved on without you detecting him?Maybe it was 2 kids blowing through these things like kazzoos. Over the years I have had some newbie hunters pullsome real dandies near me. Endless rattling and calling, yelling from stand to stand, coughing, sneezing, radios, etc.