Hunter describes a vocalization and brief sighting along the Red River witnessed in Clay County, Texas

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So I am an avid hunter and I used to hunt the Corps of Engineers land on the Texas side of the Red River. I was going to get my trail camera and check the pictures for any sign of wild hogs moving along the river and eating at the bait I had set up. When I pulled up to the parking area, I was the only truck there. It's hot in the summer and in those woods there is little breeze. It's about a 20 min walk through the woods to the camera. So I had navigated my way through the brush and had come around the old piece of original bridge supports and turned slightly north west and something yelled at me about 100 yards away, through the woods. It's hard to describe the noise. It didn't taper off, just a blast. I froze, and I don't know why, but my instinct was to 'whoop' at it. I 'whooped' and it remained frozen too. I knew where it was but I couldn't see it through the trees. I raised my rifle to locate whatever it was through the scope. I systematically started searching, and all of a s...