If you ever watch "Finding BigFoot", you see the people on there using BigFoot calls. These are like loud screams in a way. Each person (Matt, Cliff, Bob, Ranea) seems to do a different call.
I dont think they are effective, other than sounding like a wounded animal that might bring bigfoot out for a meal.
I really hate the editing they are doing. They say they now get control, but the soundtrack in the background is not helping us really hear what they heard. you get the scary music and immediately the sound and you cannot tell the difference.
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Seems to me that if BigFoots are intelligent, and they must be if they have evaded detection for such a long time, that they would be able to distinguish between a call from another BigFoot and a call from a human.