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Camper hears Sierra-type whoops and knocking near Lost Creek Wilderness, 35mi SW of Denver
The witness was camped with two children on a ridgeline near Tarryall Reservoir. On two consecutive nights the witness heard loud deep whooping calls, first from the valley below and then much closer to camp, with wood-on-wood-like banging the first night and coyotes falling silent. On the second night the witness left the tent with a rifle and light and heard something large and heavy crashing through timber with loud footsteps, then stood guard until morning and left early without telling the children.
Memory told of heavy, bipedal running heard while camping in Yellowstone National Park
In the winter of 1980 the witness and a relative camped overnight in a tent in Yellowstone after hiking and fishing. Around 10 at night while inside the tent they heard and felt something large and heavy run past on two legs for about ten seconds. They remained inside terrified until daybreak and found no tracks in the morning.