Two hunters describe vocalizations, stalking, rock-throwing, near Elbe witnessed in Pierce County, Washington

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My friend and I were hunting East of Elbe, WA in Nov 2008. We had just pulled up at our spot and were unoading our gear when we immediatly started hearing a strange sound coming from the treeline behind us. It was a whooping, tongue clicking type of sound and it was really creepy. Reminded me of the ape cage at the zoo except for the weird sound at the end. We started making similar sounds back at it and it started answering us. Then, we heard it walking north in the treeline while continuing to make the sound. We grabbed our guns and jumped back into the truck. It made it's way around to the other side of where we were but never stepped out into the open. After a few minutes, we heard and felt a thud on the road about 20 feet from our truck. We locked and loaded our guns and went to check it out. There was a small boulder in the middle of the road that was not there a few minutes before. I could tell it had been thrown there due to the fresh indents in the ground and marks...