Occurred on November 19, 2016 / Bozeman, Montana, USA
Info from Licensor: "Earlier in the morning before this video was taken this herd had passed through our backyard heading the other direction moving much more casually into the trees with the cows making lots of noise. About an hour later when this video was filmed I looked out the window and noticed they were moving through again but going the other direction and moving much quicker with a definite sense if urgency. This herd moves through our area year round but never all together like this so this was a fascinating experience. You would think it sounded like a stampeed but it sounded more like flowing water! My husband went into the wooded area that they had come out of to see if he could find what had sent them back through so urgently and he saw where they had been beaded down but really no other sign of anything that may have chased them off."