Whoops and knocks heard by four locals camping north of Bristol witnessed in Hartford County, Connecticut

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It was approximately late July early Aug, I can't recall but was summer 1987. At the Burlington Bristol Townline in Connecticut there was a woodsy area behind a Cumberland Farms store we used to go up there camping or have cake parties. One night three friends and I went up there to camp for the night. We arrived approximately 6 PM. We kept hearing what sounded like with knocks. We shrugged it off thinking there was other people up there. Approximately 11 o'clock that night we started hearing what sounded like whooping sounds. One of the friends Mike that I was with was an avid hunter. His father has been taking him hunting since he was young and even though he was 16 he spent a lot of time in the woods with his dad. He was trying to figure out what that sound was or what animal made it. He could not figure out any animal that made that sound. Again we shrugged it off and chalked it up to maybe a couple of our friends are messing with us. We decided to go to bed and we kept hea...