I’ve heard one twice in my life.
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where, in MA? NH?
In MA.
Heard it once behind my property and once at a friends property the next town over.
The call is verified Bigfoot. I spent a week trying to identify the call to known wildlife in this area. Nope. Only Bigfoot make this particular call which is a long whoop type sound. Very loud. I believe it’s a mating call.
-SB