Couple witness rocks thrown and possible vocalizations between two animals on either side of a fishing dock near Williamsville witnessed in Wayne County, Missouri

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My wife and I were night fishing off the docks of chaonia landing at lake wappapello in late fall early winter 2007. At around midnight we heard rocks being thrown into the lake from across the bank. we went to the end of the dock to see what was going on. coming down the bank along the waters edge rocks were being thrown into the water about every 50 feet or so, big rock the size of bowling balls. the bank I'm speaking of is actually an island with water on three sides of it for about 5-6 miles, and it ends right in front of the boat docks we were fishing. coming straight towards us along the bank something was throwing these boulders into the water, when out of the trees came a rock straight at us and landed in the water 6 feet in front of us followed by a very deep growl and grunt. the distance from the end of the dock and the opposite bank is maybe 50 feet. we stood there looking into the trees desperately trying to see whatever was growling at us yet it stayed just inside the tree...