Memory told of spying something large and hairy overturning rocks by the Brazos River witnessed in Johnson County, Texas

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I was 12 or 13 at the time. We had been rock climbing and repelling on the cliffs there. We had been there several times before. I had a habit of wandering off exploring. I had walked the cliff top probably a half mile away from the group I was with. I was in a very thick area in a cut or a hollow that has an overhang. Looking down you could see an undercut in the cliff. I was on top, looking across, trying to figure out if I needed to go around the top or climb down. I heard something below that sounded like some low grunts and heavy rocks rolling around. i got closer to the edge and looked over and saw "something." It was very large and I could only see its back. It was very wide with no neck. I could see its head but it did not have much neck. I could see its shoulders and back and the shoulders were very wide. It was completely covered with hair. It was crouched over and rolling the big rocks over like it was looking for something underneath. I heard some low grunts but nothing els...