YMCA camp guest has a possible nighttime sighting and hears strange vocalizations in Estes Park witnessed in Larimer County, Colorado

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Visual Incident: I was spending the evening at a 2 bedroom cabin at the YMCA in Estes Park. It had been a cold, snowy day, and I had gone to bed rather early (around 8 pm.). I awakened at 2:30 and got up to look out the bedroom window, through the curtains, just to check on the weather, see if stars were out, etc. I noticed that the basement lights were still on in the rather large, two-story 3-bedroom family cabin. This cabin was about 75 yards directly SE of my cabin (in back of me). I assumed the lights were still on since children may have been playing games that night, and simply forgot to turn out the lights. I looked out the window of about a half minute with this thought on my mind. I didn't see any movement inside the cabin basement, so I assumed the family had retired for the evening. Just as I was about to close the curtain, I saw a very tall, rather large, dark figure stride past the entirely of the basement, across the snow. The stride of this figure was very deliberate...