Hunter hears unusual vocalizations on two occassions witnessed in Lincoln County, Wyoming

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There were two separate incidents within 12hr time of sounds so unusual that, to this day, I can't explain or rationalize out of my mind. I had arrived at a campsite near Thompson Pass, the evening before the start of deer hunting season. The campsite was about 500yds off the forest service road and in a dense pine forest, near a logging trail that led to a creek. I settled in for the night in a sleeping bag in the cab of my truck, waking up at about 0400, with the need to go to the bathroom. I rolled the window down and listened for any "critters", most notably bears. Grabbing a flashlight, I left the truck and relieved myself. As I was preparing to return to the truck, I began hearing the sounds of something breathing deeply to my left and to the rear. Shining my flashlight in that direction, I saw nothing, heard nothing move. I quickly got back in the truck, and then began hearing this warbling, like a man yodeling in a high pitch, from the direction of Thompson Mountain. I rolled...