Possible encounter by young campers in their tent after hearing woodknocks near Buckley witnessed in Pierce County, Washington

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I can't exactly say it was a BF encounter, none of us but 1, saw something and 2 out of 4 people heard "the noises." I will explain my story and let you decide. Thank you. September 23, 2011, Myself and a group of friends decided to go camping late one night near the, White River. We took about a 40min walk to get to our campsite.(it was a little after 11pm.) 5min after we arrived, we heard an Elk Mating call from across the river and thought it was pretty cool, didn't think much of it. About 30min in, after we get the fire going, we heard another unexplainable "yelp" sound that echoed off. It was only one time, from a distance, possibly 1/2 of a mile or less out. We all looked at each other as if one of us could explain what it was but we couldn't and again, didn't think much of it. About a few hours later after roasting marshmellows and havin a good time, we decide it's time to hit the hay, one guy, the only one of us who drank too much, was already passed out. (There was 4 of ...