Campers hear early morning screams near Calaveras Big Trees witnessed in Calaveras County, California

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While camping in the Sierra, several members of our group were awakened by repeated screams very similar to the Klamath and Washington State sound files at bfro.net. I first heard the eerie bellowing screams at 4:45AM and they continued until 5:05AM, followed by another short series soon after . I thought it was over for the night until a short series of screams began at 6:30... from a different direction. The vocalizations were grouped in a pattern of 4 or 5 "blasts" (lung-fulls?) with a (resting?) pause of a few seconds followed by another series of 4 or 5, a pause, and so on. This continued with only slight variation for 20 straight minutes; then the two other series mentioned above. While my wife says her heart was "beating like crazy", I was simply astonished. I've been interested in the bigfoot phenomenon for more than 30 years, so I had tears in my eyes as I paid close attention to this almost indescribable sound. To my thinking there are only two possibilities to explain these ...