"The cowboys, mounted on well-trained horses, pushed the cattle down the road with snappy bull whips and the distinctive whistles, hoots and calls that ranchers have always used to keep the reluctant animals moving."
Heicher, Kathy. The Cattle Drive: Burns Hole cowboys mix tradition and technology. Photographer Mike Rawlings. Vail Trail, November 24, 1989, p.16-19., Mike Rawlings