Camper hears Sierra-type whoops and knocking near Lost Creek Wilderness, 35mi SW of Denver witnessed in Park County, Colorado

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About five years ago, in late Spring, I took my kids camping in the Lost Creek Wilderness area. They were 8 and 10 years old at the time. We go there quite a bit because it's far enough away to avoid the Denver crowds that flood local trails and parks but close enough it's not a days drive to get there. I have a spot near Tarryall Reservoir I have camped at several times before. It's a few miles off the main dirt road up a jeep trail and during the week there are usually not many people there. I like it because it's on a ridgeline overlooking a small valley. It's at the end of the Jeep trail, so on the way up and once I'm there I can easily tell if anyone is in the area or coming up on our camp. We got there on a Thursday morning and I didn't see anyone on the way nor hear anyone down in the valley below us. I had heard bigfoot stories like everyone else but never thought about it or gave them much credit. I figured it was like alien abductions or something. Weird stories th...