Loud vocalizations repeatedly disturb family witnessed in Whatcom County, Washington

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The very loud, high pitched scream occurred around 500ft behind our house. The scream occured 2 or 3 times the 1st night. The dogs hid under the house, my whole family awoke. I was only 13 at the time. My father climbed up the ladder into the loft of the house were my bed was located in the rear of the A-frame below a large window. It scared me once I saw how scared my father was. He opend the window and fired shots from his hand gun . He also set up a12 volt spot light the next day below the window. After he shot his gun off, then we heard something fleeing up the mountain. We experienced the same thing 3 or 4 more times in the next week. Always late at night. My dad would shine his light out at the noise but never saw the creature. My dad was able to get audio tape recording of the high pitch, long scream. Dad and his best friend, a Nooksack tribal member, determined it was not a mountain lion and on two occasions went out in an attempt to find a track or hair or blood. To no avail -...