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Scream
The witness, his wife and friends heard a loud chimp-like screech or scream at night above their horse camp that matched no known animal and later resembled recorded vocalizations in a documentary.
Wood knock
The father had mentioned hearing similar knocks and whoops on prior occasions.
Howl near Buford, Colorado
Years earlier the witness on a tree stand heard distant overlapping howls moving west, then a close limb break and beating on trees and brush behind him.
Howl
The witness notes similar howl-like sounds heard in the distance in past years.
Wood knock
The father heard a series of very loud knocks from up the slide earlier that same morning before the witness arrived.
Wood knock
Wood knocking was noted on the opposite side of the saddle in the same year.
Footsteps
Neighbors reported loud footsteps on their porch during the night, thinking a bear may have visited.
Vocalization near Park County
Family members who tent-camp on the same land previously heard similar sounds and dismissed them as coyotes.
Unidentified sound near Jefferson, Colorado
The witness reports hearing an atmospheric deep humming like large turbines on two prior occasions in the same area.
Scream near Lake George, Colorado
The witness and a coworker heard a loud scream twice while talking in a tent a few days earlier.
Scream
Another hunter heard daytime screaming similar to the main sound, and later that night his whole party was awakened by loud screaming.
Vocalization
Later the same day the same witness heard two loud guttural cry-moans from woods near the stables while standing by a car in heavy snow.
Unidentified sound near Estes Park CO, Colorado
The cabin owners had reportedly heard sounds at night at the secluded cabin.
Vocalization
On the night before the daytime hike, a guide reportedly heard possible vocalizations in a different canyon that became the next day's focus.
Unidentified sound
The witnesses report hearing rock-like clacking sounds answering each other from different distances.
Vocalization
The witnesses state they had previously heard similar noises at the ranch.
Unidentified sound
A short time after the sighting, a newspaper carrier who came from the area where the figure disappeared said he heard something inside an old building that frightened him and left quickly.
Unidentified sound
A few years earlier at Deer Lakes the witness's wife and daughter heard a very loud sudden crash that frightened a moose from the lake while the witness was in the restroom and heard nothing.
Wood knock
Later the same night the family parked at an ATV staging area to stargaze and heard a knock from the east ridge after getting out of the truck.
Vocalization
The author reportedly heard vocalizations and screams with response calls near Leadville in October 1994.