Indeed, some thought it was simply farmers plowing fields or stock grazing, but their origin point were mountain valleys so it doesn't seem their demise would h

Indeed, some thought it was simply farmers plowing fields or stock grazing, but their origin point were mountain valleys so it doesn't seem their demise would have been as rapid as it actually was. https://www.youtube.com/watch?v=DqyCO1eVC68&t=26m38s https://www.youtube.com/watch?v=DqyCO1eVC68&t=26m38s