Four climbers report repeated vocalizations witnessed in Lincoln County, Montana

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Four friends and I were climbing in the Cabinet Mountains Wilderness of N.W. Montana on 4th of July weekend of 1978. After making basecamp at 6500 ft. on Mt. Snowy, we built a fire and proceded to watch the fireworks 10 miles away in Libby. A call(scream) began and rose and fell over the length of about 10 seconds that silenced all 5 of us and everything in that forest. The hair on my neck stood up. Then it repeated. A few minutes later, we heard it again. It sounded like it was coming from the ridge above us. Starting like the growl of a bear, it rose slowly in pitch and strength over the 10 seconds until it peaked in a howling high-pitched scream. A survey was taken and no answers were to be found as to its origin. The next day, we summited and on the descent we discovered a cave only about 15 feet deep and lined with dead pine needles. No discussion was ever made by any of our party until a few years ago. Last summer while car camping with my son not far from the first in...