Teenagers hear strange sounds near Aberdeen witnessed in Brown County, South Dakota

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When I was a senior in high school (1986), I was staying overnight at a friend's who lived about 8 miles north of the town where I lived, Aberdeen. It's very flat in this area, although it does start to get somewhat hilly just to the north of where my friend lived--very few trees, just miles of open farmland, and very little population. He lived on a stretch of gravel road that extended about 2 miles west off of HWY 281, and there are a few other farm houses along the same road. My friend and I were sitting in his basement talking until it was quite late--about 2am. It was a very nice spring evening--nice enough to keep the basement windows open for fresh air. We were both getting pretty tired, and we were trying to talk somewhat quietly so as not to wake the rest of his family upstairs. At some point, we heard some sort of screech or scream, and we both stopped and looked at each other, wondering if we would hear it again. After a few seconds, we heard it again. My friend had lived...