Father describes possible late night vocalizations heard by his boys near Willis witnessed in Washtenaw County, Michigan

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On the first weekend of summer, 1999, two of my sons and a friend planned a Saturday night bonfire in our backyard fire pit to celebrate the end of the school year. They went out about midnight and started a wood fire to throw their books and papers into. After the fire was going, they began to throw the school stuff into the fire. The firepit is almost visible from the couch I was sitting on in the family room on the southwest side of the house. I fell asleep about 12:30 or so, and was awakened by the slam of the bathroom door at about 1:30 AM. I asked the boys what was wrong, and my younger son and his friend were crying. The oldest son was white faced and visibly shaken. They apparently heard what sounded like women screaming at the back of our yard, to the west, then north, then east, like the screamers were surrounding our yard and taking turns making the screams. The boys said that the screams sounded like they started high pitched, then descended into a low growl and were moving...