Rancher, wife startled by vocalizations near Leadville witnessed in Lake County, Colorado

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My wife and I were about to start a fire for a barbecue at our ranch south of Leadville. We had just got the fire started when we heard something like a holler or a yell in a very deep tone. The first vocalization lasted about 5 seconds. Then after a moment it hollered again. We have a large pasture behind the house where we graze our horses. After the second vocalization the horses were running "full blast" towards us. When they got to us they were very spooked. Then it hollered again, stopped, and then uttered a few short very gutteral noises. We put out the fire and left, since the sounds seemed to be very close, at the tree line on the end of the pasture. I would estimate the distance was no more than a quarter mile away. The noise this thing made is hard to describe or mimic. It had to be felt as much as heard. It was deep low frequency holler that vibrates in your bones and literally shakes your guts. You could tell it was a very large animal that was making the noise. We have h...