Memory told of strange incidents while alone at a family hunting camp near Cornell witnessed in Delta County, Michigan

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Reading another report of a Bigfoot sighting in Delta County, MI 1982 has prompted me to report the following. My family has property in Delta County (near Cornell - UP Mich). One evening during hunting season (November 1982) I was at the camp alone. It was approximately 11:00 at night. We had no electricity and was playing solitaire with a kerosene lamp for light and a wood stove for heat. I was planning on spending night and getting to my hunting blind in the morning. A fairly loud "whack" startled me. Something had hit the window/screen behind me. I turned around and looked at window but I couldn't see anything. I walked to window and peered outside but it was dark and couldn't see anything. I figured it was just "the wind" or something so sat back down. A few minutes later it happened again. Another fairly good "whack" to the window. This startled me even more. I started to think possibly someone was playing a practical joke on me. The camp is approx 30-40 feet from any trees an...