Camper hears possible vocalizations after dark near Cooper Lake witnessed in Kittitas County, Washington

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Me and two other friends arrived at a campsite near Cooper Lake Washington we settled for a campsite that was a couple of miles away from the lake because we couldn't make it past the snow. As we pulled into the dirt road that brings you to the campsite there was a tree covering the road into the site so we moved the tree and proceeded down to the campsite. We found as we got there that the previous campers have left their gear and it seemed as though they were in a hurry but we didn't think much of it other than that they were rude and disrespectful for leaving garbage and stuff laying around. After we got camp set up and got a fire going it started to get dark and down about a hundred feet of elevation in a two hundred yards away we heard a noise that none of us had ever heard before sort of like a really rapid yodel or tongue trill. The girl I was with was immediately frightened and hid behind me and my other friend said guys don't get too freaked out it's either like a wolf or a co...