Hi Tworivers71, I am glad you mentioned infrasound as it doesn't get much of a mention in BF lore, and I suspect it may play a far larger part in the story than anyone expects. There are a number of predators that generate infrasound in the USA, but if there are BFs about, there is good reason to suspect that they too generate those sounds. I am from Massachusetts and I am given to take walks in the
Bridgewater Triangle to see what I can see. These days I take an infrasound monitor with me, just in case.